MDR MERCURY DISPLACEMENT RELAYS APPLICATION DATA MERCURY DISPLACEMENT TUBE GLASS INSULATOR WELD PLUNGER GUIDE CERAMIC LINER ELECTRODE ARC QUENCHING ATMOSPHERE MAGNETIC LINER PLUNGER GUIDE BUFFER SPRING MERCURY POOL STAINLESS STEEL CAN PRINCIPLE OF OPERATION DESIGN FEATURES Mercury Displacement Relays provide a perpetually selfrenewing contact to assure maximum contact life and minimum contact resistance. Conventional contactors are destroyed by pitting and welding under high load conditions. MDRs have a single moving part that floats free on a pool of mercury. There are no hinges, pivots, pins or mechanical linkage to wear out or break. The result is a life expectancy which exceeds other types of contactors handling the same loads and duty cycle. Liquid Mercury Contact - provides a new contact surface with every actuation. Mercury is self-renewing and does not pit, weld, disintegrate or oxidize. Hermetic sealing - provides internal and external protection from arcing. The sectional view shows our normally open style Mercury Displacement tube with the plunger assembly floating on the mercury pool. Inert Gas atmosphere - contactor tube is evacuated, then pressurized with a combination of gases which extinguish arcing and contribute to long life. The pressurized gases provide for a high dielectric withstanding voltage between contact surfaces. When the coil power is off, the mercury level is below the electrode tip. No electrical path exists between the electrode and mercury pool. Low Contact Resistance - Large electrode and mercury volume creates low contact resistance and provides high inrush current capability. When coil power is applied, the plunger is drawn down into the mercury by the pull of the magnetic field. This action raises the mercury level, so it covers the end of the electrode closing the circuit. Quiet Operation - Audible noise normally associated with conventional contactors is eliminated with mercury displacement tubes and the buffer spring assembly. When coil power is turned off, the buoyant force of the mercury causes the plunger assemble to rise, dropping the mercury level, and breaking the circuit. APPLICATION DATA Mercury Displacement relays are ideal for adverse environments....Where high inrushes are encountered ....Where hermetically sealed contact operation is required because of corrosive, dirty, or moist ambient conditions. ....Where use does not permit contact maintenance. ....Where reduced noise levels are required. ....Where minimum weight and size are desired. APPLICATION OF "M" SERIES VS "ML" SERIES The series "ML" is physically the same as the "M" series except for the type of gases used in the contactor tubes. The "ML" series was developed for use with resistive and tungsten loads on AC power ONLY. The "ML" series will give much greater life than the "M" series for these types of loads and is intended for high activation use, such as molding machines or ovens. The "ML" series, however is not intended for use with motor loads on AC power, or for resistive, tungsten, or motor loads on DC power. The "M" series, which is our universal series is rated to be used on all types of loads resistive, tungsten, and motor for both AC and DC power. RECOMMENDED FUSE PROTECTION MDRs are capable of accepting high inrush currents however, short circuit currents can damage the contactor. Fast acting fuses should be used in-line with the contactor load to protect against short circuit fault current. UL class J and class RK-1 fuses are recommended. 9/04 3...11 MDR MERCURY DISPLACEMENT RELAYS F E AT U R E S CONTACT LOAD RATINGS TABLE SILENT OPERATION LISTED 367G File E52197 VOLTAGE HIGH DC VOLTAGE RATINGS OPTIONAL DIN MOUNT ADAPTERS M35 STABLE CONTACT RESISTANCE ML35 GENER AL SPECIFICATIONS (@ 25 C ) COIL Pull-in Voltage AC (50/60 Hz):< Pull-in Voltage DC:< Dropout Voltage AC (50/60 Hz):> Dropout Voltage DC:> Maximum Voltage: Resistance Tolerance: Coil Power AC (50/60 Hz): Coil Power DC: Insulation System Per UL Standard 1446: Duty: CONTA CONTACTS Material: Minimum Recommended Load: TIMING Operate Time @ Nominal voltage: Release Time @ Nominal voltage: DIELECTRIC S TRENGTH Coil to Contacts: Across Open Contacts: Pole to Pole: Contacts to Frame: Insulation Resistance: TEMPER ATURE Operating, AC Lower: Operating, AC Upper: Operating, DC Lower: Operating, DC Upper: Storage, Lower: Storage, Upper: LIFE EXPECTANC Y EXPECTANCY Electrical @ Rated Load (AC1): Mechanical @ no Load : UNITS % of nominal % of nominal % of nominal % of nominal % of nominal % VA W ML60 amps Mercury 1 @ 5 VDC or 5 W ms ms 50 80 to 100 V rms V rms V rms V rms megohms minimum@VDC 2650 2650 2650 2650 1000 @ 500 C C C C C C -40 +60 -40 +60 -55 +100 operations operations 100,000 5,000,000 grams Vertical 10% M35: AWG 6-14 wire pressure connectors M60: AWG 2-12 wire pressure connectors M100: AWG 1-8 wire pressure connectors #6-32 pan head screws 370 to 1078 Coil Terminals: 9/04 3...12 M60 Class B (130 C) Continuous MISCELLANEOUS Operating Position: Load Terminals: Weight: 80 80 78 65 110 10 7 to 26.4 3.1 to 9.1 PHONE: (843) 393-5778 FAX: (843) 393-4123 EMAIL: info@magnecraft.com M100 120 VAC 240 VAC 480 VAC 600 VAC 24 VDC 48 VDC 125 VDC 250 VDC 120 VAC 240 VAC 480 VAC 600 VAC 120 VAC 240 VAC 480 VAC 600 VAC 24 VDC 48 VDC 125 VDC 250 VDC 120 VAC 240 VAC 480 VAC 600 VAC 120 VAC 240 VAC 480 VAC 600 VAC 24 VDC 48 VDC 125 VDC 250 VDC RESISTIVE TUNGSTEN HP AMPS AMPS (AC1) (DC1) NO NC 1O 3O 35* 3* 5* 35* 35* 35* 5* 7.5* 17 17 5* 10* 35* 9 9 5* 10* 35* 7 7 35* 35* 16* 12* 35* 35* 35* 35* 60* 60* 60* 50 60* 60* 40* 20* 60* 60* 60* 50 100* 100* 100* 80 100* 100* 80* 40* 35* 35* 16* 12* 35* 17 9 7 60* 30 15 12 50* 50* 40* 20* 60* 30 15 12 100* 60* 30* 24 100* 100* 80* 40* 35* 35* 16* 12* 35* 17 9 7 45* 22.5 11.2 9 50* 50* 40* 20* 45* 22.5 11.2 9 1/2 1/2 1/2 1/2 MOTOR AMPS 1O 3O 34 30 28 19 14 14 11.2 11 27 13.5 5.2 2.6 3* 5* 34 5* 10* 28 7.5* 15* 21 7.5* 15* 16 3/4 3/4 3/4 3/4 30 28 21 17 39 19.5 7.4 3.7 * UL and CSA Listed HERMETICALLY SEALED STAINLESS STEEL TUBES Every contactor tube is hermetically sealed for maximum life. The MDR provides protection to the user from arcing and other hazards of switching heavy loads with exposed contacts. MDR MERCURY DISPLACEMENT RELAYS CLASS WM35, WM60 & WM100 SWITCH RESISTIVE, TUNGSTEN, AND MOTOR LOADS. HIGH INRUSH CAPACITY. RECOMMENDED FOR DC LOADS. CLASS WML35 & WML60 RECOMMENDED FOR LONGER LIFE WHEN SWITCHING AC RESISTIVE AND TUNGSTEN LOADS. 1, 2 & 3 POLES 35, 60 AMPS 1 POLE 100 AMPS COIL MEASURED @ 25 C STANDARD PART NUMBERS 1 POLE 35 OR 60 AMPS 2 POLES 35 OR 60 AMPS 3 POLES 35 OR 60 AMPS 1 POLE 100 AMPS PHONE: (843) 393-5778 FAX: (843) 393-4123 EMAIL: info@magnecraft.com NOMINAL RESISTANCE (OHMS) 1 POLE NORMALLY OPEN, 35 AMP 120 VAC 50/60Hz WM35A-120A 220/240 VAC 50/60Hz WM35A-240A 24 VDC WM35A-24D 2 POLE NORMALLY OPEN, 35 AMP 120 VAC 50/60Hz WM35AA-120A 220/240 VAC 50/60Hz WM35AA-240A 24 VDC WM35AA-24D 3 POLE NORMALLY OPEN, 35 AMP 120 VAC 50/60Hz WM35AAA-120A 220/240 VAC 50/60Hz WM35AAA-240A 24 VDC WM35AAA-24D 1 POLE NORMALLY CLOSED, 35 AMP 120 VAC 50/60Hz WM35B-120A ML SERIES 1 POLE NORMALLY OPEN, 35 AMP 120 VAC 50/60Hz WML35A-120A 220/240 VAC 50/60Hz WML35A-240A ML SERIES 2 POLE NORMALLY OPEN, 35 AMP 700 W 2,800 W 186 W 218 W 1,200 W 98 W 111 W 430 W 63 W 460 W 700 W 2,800 W 120 VAC 50/60Hz WML35AA-120A 220/240 VAC 50/60Hz WML35AA-240A ML SERIES 3 POLE NORMALLY OPEN, 35 AMP 120 VAC 50/60Hz WML35AAA-120A 220/240 VAC 50/60Hz WML35AAA-240A 1 POLE NORMALLY OPEN, 60 AMP 218 W 1,200 W 120 VAC 50/60Hz WM60A-120A 220/240 VAC 50/60Hz WM60A-240A 24 VDC WM60A-24D 2 POLE NORMALLY OPEN, 60 AMP 700 W 2,800 W 186 W 120 VAC 50/60Hz WM60AA-120A 220/240 VAC 50/60Hz WM60AA-240A 24 VDC WM60AA-24D 3 POLE NORMALLY OPEN, 60 AMP 120 VAC 50/60Hz WM60AAA-120A 220/240 VAC 50/60Hz WM60AAA-240A 24 VDC WM60AAA-24D 218 W 1,200 W 98 W 111 W 430 W 111 W 430 W 63 W 1 POLE NORMALLY CLOSED, 60 AMP 120 VAC 50/60Hz WM60B-120A ML SERIES 1 POLE NORMALLY OPEN, 60 AMP 120 VAC 50/60Hz WML60A-120A 220/240 VAC 50/60Hz WML60A-240A 700 W 2,800 W ML SERIES 2 POLE NORMALLY OPEN, 60 AMP 120 VAC 50/60Hz WML60AA-120A 220/240 VAC 50/60Hz WML60AA-240A 218 W 1,200 W 460 W ML SERIES 3 POLE NORMALLY OPEN, 60 AMP 120 VAC 50/60Hz WML60AAA-120A 220/240 VAC 50/60Hz WML60AAA-240A 1 POLE NORMALLY OPEN, 100 AMP WM100A-120A WM100A-240A WM100A-24D 9/04 3...14 NOMINAL INPUT VOLTAGE 120 VAC 50/60Hz 220/240 VAC 50/60Hz 24 VDC OTHER COIL VOLTAGES ARE AVAILABLE ON SPECIAL ORDER. CONTACT FACTORY FOR DETAILS 111 W 430 W 73.5 W 300 W 53 W