RSS Series Relays
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Relays
Key features of the RSS series include:
• Input status LED Indicator
• Dual SCR output
• Direct bond copper substrate
• Internal transient protection – built-in snubber
• EMC compliant (level 3)
• Photo isolation
• 1200 volt blocking voltage
• 4000 volt optical isolation
• Zero voltage turn-on
• 100% tested at rated current
• High surge capability
• Optional finger-safe
terminal cover (RSS-CVR)
Input Specifications
Series RSSDN RSSAN
Voltage Range 4 to 32V DC 90 to 280V AC
Input Current current regulated (10mA)
Pick Up Voltage 4V DC 90V AC
Drop Out Voltage 1V DC 10V AC
Dielectric Strength
(Input-Output-Base) 4000 RMS (min) 4000 RMS (min)
Capacitance
(Input to Output) 8pF 8pF
Rev. Voltage Protection Yes (–32VDC) N/A
Output Specifications
Current (continuous) 10A 25A 50A 75A 90A
1-Cycle Surge Current 150A 300A 750A 1000A 1200A
1-Second Surge Current 30A 75A 150A 225A 300A
Minimum Holding Current 50mA 50mA 100mA 100mA 100mA
Voltage Drop
at Rated Current 1.6V (maximum)
Voltage Range 48 - 660V AC
Contact 1 Form A (SPST-NO)
Over Voltage Rating 1200 PIV
Frequency Range 47 to 80Hz
Off-State Leakage
at Rated Voltage 20mA (maximum)
Turn-On Time 1/2 cycle @ 60Hz
Turn-Off Time 1/2 cycle @ 60Hz
Zero Voltage Switching Yes
Static DV/DT 200V/µsec
Commutating DV/T Snubbed for 0.5 power factor at rated load
Weight 10g (approx.)
RSS Series — Panel Mount Solid State Relays
UL Recognized
File No. E194577 10, 25, 50, 75, 90A Current Ratings
48V AC to 660V AC Output Ratings
Part Numbers: RSS Series
Continuous Output Current DC Input AC Input
10A RSSDN-10A RSSAN-10A
25A RSSDN-25A RSSAN-25A
50A RSSDN-50A RSSAN-50A
75A RSSDN-75A RSSAN-75A
90A RSSDN-90A RSSAN-90A
Part Numbers
The fingersafe cover is part no. RSS-CVR.
Relays RSS Series
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Relays
Transformer Loads
Transformer loads sometimes result in severe inrush current when the trans-
former saturates during the first cycle. Use a relay rated for this surge, which
has a 1/2 cycle surge current greater than the maximum applied line voltage ÷
the transformer’s primary resistance (approximately 10x rated current).
Recommended Loads
Heater Loads
When using solid state relays for driving heaters where the load is switched
on and off rapidly and continuously, severe thermal stress will result. In such
cases, use an SSR relay at no more than 75% of the rating.
Recommended Loads
Solenoid Valves and Contactors
RSS relays use high-noise immunity circuitry with a snubber to handle the
electrical noise generated by inductive loads.
Recommended Loads
RSS series relays provide a highly reliable means of switching AC loads when
applied properly. Read the following technical notes prior to installing IDEC’s
quality solid state relays.
UL Motor Load Ratings (HP Ratings)
SSR Rating at 120V AC at 240V AC
2A 150VA 300VA
4A 200VA 400VA
10A 500VA 1KVA
25A 1KVA 2KVA
50A 2KVA 4KVA
SSR Rating at 120V AC at 240V AC
2A 250W 500W
4A 400W 800W
10A 1KW 2KW
25A 2KW 4KW
50A 3KW 6KW
SSR Rating at 120V AC at 240V AC
2A 250W 500W
4A 400W 800W
10A 900W 1,800W
25A 2,100W 4,200W
50A 3,800W 7,500W
Part Number 120V 240V 480V
10A 1/2 3/4 3/4
25A 1/2 3/4 3/4
50A 3/4 11/211/2
75A 3/4 5 5
90A 3/4 5 5
Recommended Loads
Lamp Loads
Zero voltage switching is ideal for driving incandescent lamps,
since the cold filament will not be subjected to a large inrush
current. Using a zero-switched SSR will reduce inrush current
and prolong lamp life.
Recommended Loads
Internal Circuit Block Diagram
SSR Rating at 120V AC at 240V AC
2A 2A 2A
4A 3A 3A
10A 1KW 2KW
25A 2KW 4KW
50A 3KW 6KW
SNUBBER
TRIGGER
CIRCUIT
AC INPUT EQUIVALENT CIRCUIT
4
3 2
1
SNUBBER
TRIGGER
CIRCUIT
DC INPUT EQUIVALENT CIRCUIT
4
3 2
1
RSS Series Relays
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Relays
Environment
Do not install SSRs near sources of excessive heat. Make sure applications are dry and well ventilated.
If SSRs must be installed in an environment subject to high temperatures or poor ventilation, or if SSRs are mounted collectively, reduce the load current so that it
does not approach the ambient temperature-load current recommendation. (See the Temperature Derating Curves on the following page.)
When SSRs are used with inductive loads, suppress the inrush current to half of the peak surge current.
Heat Sinks
Heat sinks are recommended for 10, 25, 50, 75, and 90 amp rated solid state relays depending on ambient temperature and mounting position. The recommended
heat sink dimensions and material are shown in the table:
Using a thermal compound between the base of the SSR and the heat sink for heat dissipation is recommended.
Wiring
Locate SSRs as far from motor leads as possible to prevent malfunction from induced current.
Use shielded wires for input leads when they are exposed to a source of induced current.
Mounting
Provide sufficient ventilation.
Use #6 – 32 screws, flat washers, and lock washers to secure mounting on heat sinks.
Vertical mounting is recommended to allow air to flow unimpeded. Horizontal or inverted mounting is possible, but the SSR must be derated according to the der-
ating curves on the following page.
Additional Information
Do not exceed the load voltage and current specifications.
A small-capacity load may not turn off due to the leakage current present after the SSR has turned off. If this is the case, use a resistor in parallel with the load to
shunt the leakage current.
Observe the polarity of input terminals. Failure to do so may cause damage to the SSR.
When the SSR output is subjected to a higher than rated voltage, a varistor or other element should be connected to the output terminals to absorb the over-volt-
age.
When the input signal contains a ripple voltage, the lowest ripple amplitude should exceed the minimum pick-up voltage of 4V.
Output Rating Dimensions Material
10A 12" x 12" x 1/8" Aluminum (black anodized)
25A 12" x 12" x 1/8" (DC/AC) Aluminum (black anodized)
25A 15" x 15" x 1/8" (AC/AC) Aluminum (black anodized)
50A 15" x 15" x 1/8" Aluminum (black anodized)
75A 17" x 17" x 1/8" Aluminum (black anodized)
90A 17" x 17" x 1/8" Aluminum (black anodized)
Technical Notes
Over 4V
0V Lowest Voltage
Relays RSS Series
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Relays
Temperature Derating Curves: RSS Series
80
20 30 40 50 60 70 90 100
25
20
15
10
5
10 Amp
Mounted on Heatsink
Heatsink
25 Amp Unit-Free Air
10 Amp Unit-Free Air
Derating Curve
10-Amp and 25-Amp
80
20 30 40 50 60 70 90 100
100
80
60
50
20
90 Amp
Mounted on Heatsink
75 Amp
50 Amp Heatsink
90 Amp Unit-Free Air
50 Amp-Free Air
Derating Curve
50-Amp, 75-Amp, and 90-Amp
Relay Base Temp (°C)
Relay Base Temp (°C)
RMS On-State Current (Amps)
RMS On-State Current (Amps)
Mounted on
Heatsink
For information on heat sink size, refer to the Technical Notes on
the previous page.
Material: Polycarbonate-Clear
RSS Series
RSS Dimensions
1.9" (48.26mm)
2.4" (6.96mm)
2.65" (67.31mm)
0.5" (12.70mm)
0.37" (9.40mm)
0.79"
(20.07mm)
1.075"
(27.31mm)
12
3+
-4
6-32 Pan Head Screw
Small Saddle Clamp
Large Saddle Clamp 1.75" (44.5mm)
1.1" (27.9mm)
0.2"
(4.8mm)
1.88" (47.6mm)
1.0" (25.4mm)
2.25" (57.2mm)
1.7" (43.2mm)
8-32 Pan Head Screw
ø0.187"
(4.5mm)
R 0.265" (6.7mm)
0.09" (2.3mm)
0.95" (24.1mm)
RSS-CVR (finger-safe cover)
All dimensions in mm.
