Relays & Sockets RJ Series Compact and rugged power relays. Large switching capacity. * Compact housing only 12.7-mm wide. Large contact rating RJ1 (1-pole): 16A (UL general use rating @250V AC) RJ2 (2-pole): 8A * Non-polarized LED indicator available on blade type. IDEC's unique light guide structure enables high visibility of coil status from any direction. * Excellent electrical and mechanical life. Electrical life: 200,000 operations (AC load) Mechanical life: 30 million operations (AC coil) * RoHS directive compliant (EU directive 2002/95/EC). Contains no lead, cadmium, mercury, hexavalent chromium, PBB or PBDE). * Diode model: Diode reverse withstand voltage: 1000V * UL recognized, CSA certified, EN compliant. Display Lights Switches & Pilot Lights RJ Series Slim Power Relays CSA C22.2 No. 14 1608322 CSA File No. LR35144 UL508 UL File No. E55996 EN61810-1 VDE (REG.-Nr B312) Reg.-Nr. B312 EN61810-1 EC Low Voltage Directive Relays & Sockets Part Number Selection Terminal Contact SPDT Timers Blade DPDT SPDT Terminal Blocks PCB Model Part Number Standard RJ1S-C- with LED RJ1S-CL- with Surge Suppresion Diode RJ1S-CD- with LED & Surge Suppresion Diode RJ1S-CLD- Standard RJ2S-C- with LED RJ2S-CL- with Surge Suppresion Diode RJ2S-CD- with LED & Surge Suppresion Diode RJ2S-CLD- Standard RJ1V-C- A24, A110, A120, A220, A240, D12, D24, D48, D100 D12, D24, D48, D100 A24, A110, A120, A220, A240, D12, D24, D48, D100 D12, D24, D48, D100 High Capacity RJ1V-CH- Standard RJ1V-A- High Capacity RJ1V-AH- DPDT Standard RJ2V-C- DPST-NO Standard RJ2V-A- SPST-NO Coil Voltage Code (Standard Stock in bold) A24, A110, A120, A220, A240, D5, D6, D12, D24, D48, D100 Ordering Information When ordering, specify the Part No. and coil voltage code: (example) RJ1S-CPart No. A120 Coil Voltage Code Coil Voltage Table Circuit Breakers Coil Voltage Code Coil Rating 736 A12 A24 A110 A120 A220 A240 D5 D6 D12 D24 D48 D100 12V AC 24V AC 110V AC 120V AC 220V AC 240V AC 5V DC 6V DC 12V DC 24V DC 48V DC 100-110V DCV DC www.idec.com Relays & Sockets RJ Series Standard DIN Rail Mount Finger-safe DIN Rail Mount PCB Mount Blade Models RJ1S (Std) SJ1S-05B SJ1S-07L SJ1S-61 SJ9Z-C1 SJ1S-05B, SJ1S-07L, SJ2S-05B, SJ2S-07L RJ2S (Std) SJ2S-05B SJ2S-07L SJ2S-61 SQ9Z-C SQ1V-07B, SQ2V-07B PCB Models Replacement Hold Down Springs Relays RJ1V (Std) -- SQ1V-07B* SQ1V-63* SQ9Z-C63 SQ1V-63, SQ2V-63 RJ1V (HC) RJ2V -- SQ2V-07B* SQ2V-63* Part Number Used With Socket Jumpers for SJ Sockets Poles Part Number SJ9Z-JF2 5 SJ9Z-JF5 8 SJ9Z-JF8 10 SJ9Z-JF10 Quantity Must purchase in quantities of 10. Display Lights 2 Switches & Pilot Lights Sockets *Hold-down clip or spring must be removed to use with RJ PCB relays. Accessories Description Appearance Use with Part No. Remarks All DIN rail sockets BNDN1000 DIN Rail End Stop DIN rail BNL5 9.1 mm wide. Relays & Sockets Aluminum DIN Rail (1 meter length) IDEC offers a low-profile DIN rail (BNDN1000). The BNDN1000 is designed to accommodate DIN mount sockets. Made of durable extruded aluminum, the BNDN1000 measures 0.413 (10.5mm) in height and 1.37 (35mm) in width (DIN standard). Standard length is 39" (1,000mm). Specifications Model RJ1 RJ2 1-pole 2-pole Contact Configuration SPDT DPDT Contact Material Silver-nickel alloy Degree of Protection IP40 Contact Resistance (initial value) (*1) 50 m maximum Operate Time (*2) 15 ms maximum Release Time (*2) 10 ms maximum (with diode: 20 ms maximum) 5000V AC, 1 minute Between contacts of the same pole 1000V AC, 1 minute 1000V AC, 1 minute Between contacts of different poles -- 3000V AC, 1 minute Vibration Resistance Operating extremes 10 to 55 Hz, amplitude 0.75 mm Damage limits 10 to 55 Hz, amplitude 0.75 mm Shock Resistance Operating extremes NO contact: 200 m/s2, NC contact: 100 m/s2 Damage limits 1000 m/s2 Dielectric Strength 5000V AC, 1 minute AC load: 200,000 operations minimum (operation frequency 1800 operations per hour) DC load: 100,000 operations minimum (operation frequency 1800 operations per hour) Mechanical Life (no load) AC coil: 30,000,000 operations minimum (operation frequency 18,000 operations per hour) DC coil: 50,000,000 operations minimum (operation frequency 18,000 operations per hour) Operating Temperature (*3) -40 to +70C (no freezing) Operating Humidity 5 to 85% RH (no condensation) Weight (approx.) 19g (blade type), 17g (PCB form C type), 16g (PCB form A type) Circuit Breakers Electrical Life (rated load) Terminal Blocks Between contact and coil Timers Number of Poles Note: Above values are initial values. 1. Measured using 5V DC, 1A voltage drop method. 2. Measured at the rated voltage (at 20C), excluding contact bounce time. 3. 100% rated voltage. USA: 800-262-IDEC Canada: 888-317-IDEC 737 Relays & Sockets RJ Series AC 24V 120V 240V Blade & PCB Models Relays & Sockets DC PCB Models 50Hz 43.9 8.8 4.3 60Hz With LED1 50Hz 60Hz 37.5 47.5 41.1 7.5 8.7 7.4 3.7 4.3 3.7 Rated Current (mA) 15% (at 20C) Coil Resistance (ohms)10% (at 20C) Operating Characteristics2 243 6,400 25,570 Pickup Voltage Dropout Voltage Maximum Allowable Voltage3 80% max 30% min 140% Coil Resistance (ohms)10% (at 20C) Coil Voltage Code Without LED1 With LED1 12V D12 44.2 48.0 271 24V 48V 100-110V 5V 6V 12V 24V 48V 100-110V D24 D48 D100 D5 D6 D12 D24 D48 D100 22.1 11.0 5.3 - 5.8 106 88.3 44.2 22.1 11.0 5.3 - 5.8 25.7 10.7 5.2 - 5.7 - - - - - - 1,080 4,340 18,870 47.2 67.9 271 1,080 4,340 18,870 0.9VA (60Hz) Operating Characteristics2 Pickup Voltage Dropout Voltage 70% max 10% min Power Consumption Maximum Allowable Voltage3 Power Consumption 170% 0.53W 160% 70% max 170% 10% min 0.53-0.64W 160% 1. LED Indicator is only available on Blade relays. 2. Operating characteristics are at 20C. 3. The maximum allowable voltage is the maximum value which can be applied to the relay coils. Contact Ratings Model NO NC NO NC 2 poles NO Standard Type PCB Models Allowable Contact Power Resistive Inductive Load Load 3000V AC 1875VA 3000V AC 1875VA 2000V AC 1000VA 2000V AC 1000VA 3000V AC 1875VA 360W 180W 3000V AC 1875VA 180W 90W 4000V AC 2000VA 480W 240W 4000V AC 2000VA 240W 120W 2000V AC 1000VA 240W 120W 2000V AC 1000VA 120W 60W Contact 1 pole Blade Models Contact Ratings Terminal Blocks Timers Without LED1 A24 A120 A240 Rated Voltage Blade Models Rated Current (mA) 15% (at 20C) Coil Voltage Code Rated Voltage Coil Ratings Display Lights Switches & Pilot Lights Coil Ratings NC 1 pole NO High Capacity Type NC NO 2 poles NC Rated Load Voltage 250V AC 250V AC 250V AC 250V AC 250V AC 30V DC 250V AC 30V DC 250V AC 30V DC 250V AC 30V DC 250V AC 30V DC 250V AC 30V DC Resistive Load 12A 12A 8A 8A 12A 12A 12A 6A 16A 16A 16A 8A 8A 8A 8A 4A Inductive Load coso=0.3 L/R=7ms 7.5A 7.5A 4A 4A 7.5A 6A 7.5A 3A 8A 8A 8A 4A 4A 4A 4A 2A Allowable Switching Current Allowable Switching Voltage Minimum Applicable Load 16A 6A 4A 4A AC250V DC30V DC5V 100mA AC250V DC30V DC5V 100mA AC250V DC125V DC5V 100mA AC250V DC125V DC5V 100mA AC250V DC125V DC5V 10mA 12A 6A 16A 8A 8A 4A Agency Ratings UL Voltage Circuit Breakers CSA General Use RJ1 VDE Resistive RJ2 RJ1 Inductive RJ2 RJ1 Resistive RJ1 RJ2 RJ1 RJ2 NO NC NO NC NO NC NO NC NO NC NO NC NO NO NO NO 250V AC 16A 6A 8A 4A 12A 12A 8A 8A 7.5A 7.5A 4A 4A 12A 8A 6A 3A 30V DC 12A 6A 8A 4A 12A 6A 8A 4A 6A 3A 4A 2A 12A 8A 2.5A 2A *According to the utilization categories of IEC60947-5-1 738 www.idec.com RJ2 AC-15, DC-13* Relays & Sockets RJ Series Socket Specifications DIN Rail/ Panel Mount Finger-safe DIN Rail/ Panel Mount Electrical Rating Wire Size Torque SJ1S-05B M3 screw with captive wire clamp 250V, 12A Maximum up to 2 - #14 AWG 0.6 - 1.0N*m (Maximum 1.2N*m) SJ2S-05B M3 screw with captive wire clamp 250V, 8A Maximum up to 2 - #14 AWG 0.6 - 1.0N*m (Maximum 1.2N*m) SJ1S-07L M3 screw with captive wire clamp, fingersafe 250V, 12A Maximum up to 2 - #14 AWG 0.6 - 1.0N*m (Maximum 1.2N*m) SJ2S-07L M3 screw with captive wire clamp, fingersafe 250V, 8A Maximum up to 2 - #14 AWG 0.6 - 1.0N*m (Maximum 1.2N*m) SQ1V-07B M3 screw with box clamp, fingersafe 300V, 12A Maximum up to 2 - #14 AWG 1.0N*m Maximum SQ2V-07B M3 screw with box clamp, fingersafe 300V, 10A Maximum up to 2 - #14 AWG 1.0N*m Maximum SJ1S-61 PCB mount 250V, 12A -- -- SJ2S-61 PCB mount 250V, 8A -- -- SQ1V-63 PCB mount 300V, 12A -- -- SQ2V-63 PCB mount 300V, 12A -- -- Display Lights PCB Mount Terminal Switches & Pilot Lights Socket Electrical Life Curve (Resistive Load) RJ1 RJ1 High Capacity 30V DC Resistive Load (NO Contact) 10 1 0.1 1 Load Current (A) 1000 250V AC Resistive Load (NO contact) 100 30V DC Resistive Load (NO Contact) 10 1 12 (x 10,000 operations) 250V AC Resistive Load (NO contact) 100 (x 10,000 operations) (x 10,000 operations) 1000 0.1 1 Load Current (A) Relays & Sockets 1000 RJ2 250V AC Resistive Load (NO contact) 100 30V DC Resistive Load (NO Contact) 10 1 16 0.1 1 Load Current (A) 8 Maximum Switching Capacity (Resistive Load) RJ1 High Capacity Timers RJ1 RJ2 AC Resistive (NO Contact) 10 DC Resistive (NO Contact) DC Resistive (NC Contact) DC Inductive (NO Contact) 1 10 100 250 Load Voltage (V) 1 DC Resistive (NO Contact) 0.1 1 10 8 DC Inductive (NC Contact) DC Resistive (NO Contact) 0.1 Load Current (A) Load Current (A) 1 AC Resistive (NO Contact) AC Inductive 16 Terminal Blocks Load Current (A) AC Resistive 12 10 1 10 100 250 0.1 1 Load Voltage (V) 10 100 250 Load Voltage (V) Circuit Breakers USA: 800-262-IDEC Canada: 888-317-IDEC 739 Relays & Sockets RJ Series Load Current 12A x 1 pole No Load Current 0 10 20 30 40 50 60 130 120 110 100 90 80 70 60 50 40 30 20 10 0 70 RJ2 (AC Coil, 60 Hz) Temperature Rise (C) Load Current 8A x 2 poles No Load Current 10 20 30 10 20 30 40 50 60 70 40 50 60 DC Coil Load Current 12A x 1 pole No Load Current 10 0 70 130 120 110 100 90 80 70 60 50 40 30 20 10 0 Ambient Temperature (C) Load Current 8A x 2 poles No Load Current 20 30 30 40 50 60 70 RJ2 (DC Coil) AC Coil (50 Hz) 10 20 Ambient Temperature (C) RJ2 (AC Coil, 50 Hz) DC Coil 0 No Load Current 130 120 110 100 90 80 70 60 50 40 30 20 10 Ambient Temperature (C) Ambient Temperature (C) 130 120 110 100 90 80 70 60 50 40 30 20 10 Load Current 12A x 1 pole Temperature Rise (C) 130 120 110 100 90 80 70 60 50 40 30 20 10 RJ1 (DC Coil) Temperature Rise (C) AC Coil (50 Hz) Temperature Rise (C) RJ1 (AC Coil, 50 Hz) AC Coil (60 Hz) Temperature Rise (C) RJ1 (AC Coil, 60 Hz) Temperature Rise (C) Relays & Sockets Display Lights Switches & Pilot Lights Operating Temperature and Coil Temperature Rise 40 50 60 130 120 110 100 90 80 70 60 50 40 30 20 10 DC Coil Load Current 8A x 2 poles No Load Current 0 70 10 20 30 40 50 60 70 Ambient Temperature (C) Ambient Temperature (C) The above temperature rise curves show characteristics when 100% the rated coil voltage is applied. The slanted dashed line indicates allowable temperature rise for the coil at different ambient temperatures. Timers Internal Connection (View from Bottom) RJ1S-C-* Standard RJ2S-C-* Standard 1 (A1) 1 (A1) 2(12) 3(11) 4(14) 5 (A2) 2(12) 4(11) 3(14) 8 (A2) Terminal Blocks RJ1S-CL-* With LED Indicator RJ2S-CL-* With LED Indicator 1 (A1) 1 (A1) 7(22) 6(21) 5(24) 1 (A1) 1 (A1) 2(12) 3(11) 4(14) 2(12) 3(11) 4(14) 5 (A2) 2(12) 4(11) 3(14) Coil voltage 24V AC/DC and below 5 (A2) 2(12) 4(11) 3(14) 8 (A2) Coil voltage greater than 24V AC/DC RJ1S-CD-* With Diode 7(22) 6(21) 5(24) Coil voltage 24V AC/DC and below 8 (A2) 7(22) 6(21) 5(24) Coil voltage greater than 24V AC/DC RJ2S-CD-* With Diode 1 (A1) - 1 (A1) - 2(12) 3(11) 4(14) Circuit Breakers 5 + 2(12) 4(11) 3(14) 8 + (A2) (A2) RJ1S-CLD-* With LED Indicator and Diode 1 (A1) - 7(22) 6(21) 5(24) RJ2S-CLD-* With LED Indicator and Diode 1 (A1) - 1 (A1) - 1 (A1) - 2(12) 3(11) 4(14) 5 + (A2) 2(12) 4(11) 3(14) Coil voltage 24V DC and below 740 5 + (A2) 2(12) 4(11) 3(14) Coil voltage greater than 24V DC 8 + (A2) 7(22) 6(21) 5(24) Coil voltage 24V DC and below www.idec.com 2(12) 3(11) 4(14) 8 + (A2) 7(22) 6(21) 5(24) Coil voltage greater than 24V DC Relays & Sockets RJ Series Dimensions (mm) RJ2S 27.0 28.0 27.0 RJ1S Switches & Pilot Lights Blade Relay (mm) 6.0 5.0 le ho 3 31.1 .2 4 7 6 5 o1 0.5 12.7 2 3 4 2 8 5 3 1 1 12.7 3 x 2.6 0.5 2.6 x ho le 0.5 4.8 31.1 o1 .8 Display Lights 0.5 4.8 28.8 Relays & Sockets 28.8 All dimensions in mm. PCB Relay (mm) RJ1V-A-* 1.0 13 max. (12.7) 20.0 4.0 29 max. (28.8) 0.5 7.5 (2.6) 0.5 29 max. (28.8) 20.0 3.5 1.0 13 max. (12.7) 1.0 13 max. (12.7) (1.9) 20.0 6-o 1.3 hol es 29 max. (28.8) (1.9) 0.5 7.5 (2.6) 0.3 0.5 20.0 Terminal Blocks 0.5 0.5 5.0 7.5 (2.6) 8-o 5.0 1.3 hol es 0.5 0.3 RJ1V-AH-*/RJ2V-A-* 25.5 max. (25.3) 0.3 RJ1V-CH-*/RJ2V-C-* 0.3 25.5 max. (25.3) 0.3 (1.9) (1.9) 4.0 0.5 4.0 0.5 0.5 29 max. (28.8) 4-o 1.3 hol es 25.5 max. (25.3) 0.3 0.3 3.5 7.5 (2.6) 5-o 1.3 hol 3.5 es Timers 4.0 25.5 max. (25.3) 0.3 RJ1V-C-* 5.0 1.0 13 max. (12.7) Circuit Breakers USA: 800-262-IDEC Canada: 888-317-IDEC 741 Relays & Sockets RJ Series SJ1S-05B SJ2S-05B M3 Terminal Screws 6 6 M3 Teminal Screws 71 5 (A2) 3 (14) 8 (A2) (A1) 1 2 (12) 71 o4 2 4.3 55.7 29.7 o4 2 Display Lights 4.3 55.7 29.7 15.5 15.5 Switches & Pilot Lights Dimensions con't (mm) Standard DIN Rail Mount Sockets (11) 7 (A1) 1 4 2 (TOP VIEW) (22) (24) (12) (14) 5 6 (21) (11) 3 4 (TOP VIEW) Finger-safe DIN Rail Mount Sockets SJ2S-07L M3 Teminal Screws M3 Terminal Screws o5.6 o5.6 Timers 5 (A2) 3 (14) 1 (A1) 71 4.3 (11) 4 8 2 (12) 1 (A2) (A1) (TOP VIEW) 35.5 49.5 55.7 21.5 29.7 o3 o3 2 71 2 4.3 35.5 49.5 55.7 21.5 29.7 15.5 15.5 Relays & Sockets SJ1S-07L 5 7 (24) (22) (14) (12) 4 2 (21) 6 3 (11) (TOP VIEW) SQ2V-07B Circuit Breakers Terminal Blocks SQ1V-07B A2 A1 A2 11 14 24 21 22 14 11 12 12 A1 (TOP VIEW) (TOP VIEW) 742 www.idec.com Relays & Sockets RJ Series Dimensions con't (mm) SJ1S-61 SJ2S-61 32.5 32.5 (4.3) Terminal Arrangement 1 4 3 5.0 0.1 Terminal Arrangement (Bottom View) 1 2 3 4 8 7 6 5 s le ho Display Lights 4.0 1.0 1.0 s le ho 36.5 6 1. 36.5 20.0 0.1 5.0 0.1 .3 o1 8- o 5- 15.0 0.1 2 7.50.1 (Bottom View) 5 4.0 0.1 14.0 6.0 0.1 4.00.1 4.5 0.1 7.0 0.1 14.0 (4.7) 4.0 Switches & Pilot Lights PC Mount Sockets SQ1V-63 SQ2V-63 Relays & Sockets Timers Terminal Blocks Circuit Breakers USA: 800-262-IDEC Canada: 888-317-IDEC 743 Relays & Sockets Operating Instructions Driving Circuit for Relays Protection for Relay Contacts 1. To ensure correct relay operation, apply rated voltage to the relay coil. 1. The contact ratings show maximum values. Make sure that these values are not exceeded. When an inrush current flows through the load, the contact may become welded. If this is the case, connect a contact protection circuit, such as a current limiting resistor. 2. Input voltage for the DC coil: A complete DC voltage is best for the coil power to make sure of stable relay operation. When using a power supply containing a ripple voltage, suppress the ripple factor within 5%. When power is supplied through a rectification circuit, the relay operating characteristics, such as pickup voltage and dropout voltage, depend on the ripple factor. Connect a smoothing capacitor for better operating characteristics as shown below. Display Lights Pulsation Smoothing Capacitor + - Emin Emax Emean R Relay Ripple Factor (%) DC 2. Contact protection circuit: When switching an inductive load, arcing causes carbides to form on the contacts, resulting in increased contact resistance. In consideration of contact reliability, contact life, and noise suppression, use of a surge absorbing circuit is recommended. Note that the release time of the load becomes slightly longer. Check the operation using the actual load. Incorrect use of a contact protection circuit will adversely affect switching characteristics. Four typical examples of contact protection circuits are shown in the following table: Emax - Emin x 100% Emean Incorrect Correct TE R R Ind. Load Ind. Load R Power D Varistor Power - R Relay This protection circuit can be used for both AC and DC load power circuits. R: Resistor of approximately the same resistance value as the load C: 0.1 to 1 F Ind. Load Ind. Load This protection circuit can be used for both AC and DC load power circuits. For a best result, when using a power voltage of 24 to 48V AC/DC, connect a varistor across the load. When using a power voltage of 100 to 240V AC/DC, connect a varistor across the contacts. 3. Do not use a contact protection circuit as shown below: Back emf suppressing diode + This protection circuit can be used when the load impedance is smaller than the RC impedance in an AC load power circuit. * R: Resistor of approximately the same resistance value as the load * C:0.1 to 1 F This protection circuit can be used for DC load power circuits. Use a diode with the following ratings. Reverse withstand voltage: Power voltage of the load circuit x 10 Forward current: More than the load current + - 4. Surge suppression for transistor driving circuits: When the relay coil is turned off, a high-voltage pulse is generated, causing a transistor to deteriorate and sometimes to break. Be sure to connect a diode to suppress the back electromotive force. Then, the coil release time becomes slightly longer. To shorten the coil release time, connect a Zener diode between the collector and emitter of the transistor. Select a Zener diode with a Zener voltage slightly higher than the power voltage. Terminal Blocks R C Power Io Timers C RC 3. Leakage current while relay is off: When driving an element at the same time as the relay operation, special consideration is needed for the circuit design. As shown in the incorrect circuit below, leakage current (Io) flows through the relay coil while the relay is off. Leakage current causes coil release failure or adversely affects the vibration resistance and shock resistance. Design a circuit as shown in the correct example. Power Diode Relays & Sockets Emax = Maximum of pulsating current Emin = Minimum of pulsating current Emean = DC mean value Varistor Switches & Pilot Lights Operating Instructions C Power C Power Load Load This protection circuit is very effective in arc suppression when opening the contacts. But, the capacitor is charged while the contacts are opened. When the contacts are closed, the capacitor is discharged through the contacts, increasing the possibility of contact welding. This protection circuit is very effective in arc suppression when opening the contacts. But, when the contacts are closed, a current flows to charge the capacitor, causing contact welding. Generally, switching a DC inductive load is more difficult than switching a DC resistive load. Using an appropriate arc suppressor, however, will improve the switching characteristics of a DC inductive load. Circuit Breakers Soldering 1. When soldering the relay terminals, use a soldering iron of 30 to 60W, and quickly complete soldering (within approximately 3 seconds). 2. Use a non-corrosive rosin flux. 774 www.idec.com Relays & Sockets Operating Instructions Operating Instructions con't 1. General notice: To maintain the initial characteristics, do not drop or shock the relay. The relay cover cannot be removed from the base during normal operation. To maintain the initial characteristics, do not remove the relay cover. 2. UL and CSA ratings may differ from product rated values determined by IDEC. 3. Do not use relays in the vicinity of strong magnetic field, as this may affect relay operation. Use the relay in environments free from condensation, dust, sulfur dioxide (SO2), and hydrogen sulfide (H2S). Switches & Pilot Lights Other Precautions Make sure that the coil voltage does not exceed applicable coil voltage range. Display Lights Safety Precautions * Turn off the power to the relay before starting installation, removal, wiring, maintenance, and inspection of the relays. Failure to turn power off may cause electrical shock or fire hazard. * Use wires of the proper size to meet voltage and current requirements. Tighten the terminal screws on the relay socket to the proper tightening torque. * Surge absorbing elements on AC relays with RC or DC relays with diode are provided to absorb the back electromotive force generated by the coil. When the relay is subject to an excessive external surge voltage, the surge absorbing element may be damaged. Add another surge absorbing provision to the relay to prevent damage. * Before operating the latching lever of the RU relay, turn off the power to the RU relay. After checking the circuit, return the latching lever to the original position. * Do not use the latching lever as a switch. The durability of the latching lever is a minimum of 100 operations. * When using DC loads on 4PDT relays, apply a positive voltage to terminals of neighboring poles and a negative voltage to the other terminals of neighboring poles to prevent the possibility of short circuits. Relays & Sockets * Observe specifications and rated values, otherwise electrical shock or fire hazard may be caused. Precautions for the RU Relays * DC relays with a diode have a polarity in the coil terminals. Apply the DC voltage to the correct terminals. Timers Terminal Blocks Circuit Breakers USA: 800-262-IDEC Canada: 888-317-IDEC 775