RSS Series Relays
Part Numbers
RSS Series — Panel Mount Solid State 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)
E
UL Recognized
File No. E194577
10, 25, 50, 75, 90A Current Ratings
48V AC to 660V AC Output Ratings
Series RSSDN RSSAN
Relays
Voltage Range
Input Current
Pick Up Voltage
Drop Out Voltage
Dielectric Strength
(Input-Output-Base)
Input Specifications
Capacitance
(Input to Output)
Rev. Voltage Protection
Current (continuous)
1-Cycle Surge Current
1-Second Surge Current
Minimum Holding Current
Voltage Drop
at Rated Current
Voltage Range
Contact
Over Voltage Rating
Frequency Range
Off-State Leakage
Output Specifications
at Rated Voltage
Turn-On Time
Turn-Off Time
Zero Voltage Switching
Static DV/DT
Commutating DV/T
Weight
4 to 32V DC 90 to 280V AC
current regulated (10mA)
4V DC 90V AC
1V DC 10V AC
4000 RMS (min) 4000 RMS (min)
8pF 8pF
Yes (–32VDC) N/A
10A 25A 50A 75A 90A
150A 300A 750A 1000A 1200A
30A 75A 150A 225A 300A
50mA 50mA 100mA 100mA 100mA
1.6V (maximum)
48 - 660V AC
1 Form A (SPST-NO)
1200 PIV
47 to 80Hz
20mA (maximum)
1/2 cycle @ 60Hz
1/2 cycle @ 60Hz
Yes
200V/µsec
Snubbed for 0.5 power factor at rated load
10g (approx.)
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
The fingersafe cover is part no. RSS-CVR.
E-36 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC
Relays RSS Series
Recommended Loads
Transformer Loads
Transformer loads sometimes result in severe inrush current when the transformer 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
SSR Rating at 120V AC at 240V AC
2A 150VA 300VA
4A 200VA 400VA
10A 500VA 1KVA
25A 1KVA 2KVA
50A 2KVA 4KVA
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
SSR Rating at 120V AC at 240V AC
2A 250W 500W
4A 400W 800W
10A 1KW 2KW
25A 2KW 4KW
50A 3KW 6KW
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
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
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
SSR Rating at 120V AC at 240V AC
2A 2A 2A
4A 3A 3A
10A 1KW 2KW
25A 2KW 4KW
50A 3KW 6KW
Internal Circuit Block Diagram
4
TRIGGER
CIRCUIT
3 2
AC INPUT EQUIVALENT CIRCUIT
4
TRIGGER
CIRCUIT
3 2
DC INPUT EQUIVALENT CIRCUIT
1
SNUBBER
1
SNUBBER
E
Relays
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)
Part Number 120V 240V 480V
10A 1/2 3/4 3/4
25A 1/2 3/4 3/4
50A 3/4 11/
75A 3/4 5 5
90A 3/4 5 5
2
11/
2
www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC E-37
RSS Series Relays
Technical Notes
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:
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)
E
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.
Relays
Use shielded wires for input leads when they are exposed to a source of induced current.
75A 17" x 17" x 1/8" Aluminum (black anodized)
90A 17" x 17" x 1/8" Aluminum (black anodized)
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 derating 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-voltage.
When the input signal contains a ripple voltage, the lowest ripple amplitude should exceed the minimum pick-up voltage of 4V.
Over 4V
0V
Lowest Voltage
E-38 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC
Relays 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
Temperature Derating Curves: RSS Series
For information on heat sink size, refer to the Technical Notes on
the previous page.
E
Relays
RSS Series
8-32 Pan Head Screw
Large Saddle Clamp
2.25" (57.2mm)
6-32 Pan Head Screw
Small Saddle Clamp
0.09" (2.3mm)
1.75" (44.5mm)
1.1" (27.9mm)
1
1.7" (43.2mm)
-4
R 0.265" (6.7mm)
ø0.187"
(4.5mm)
2
1.88" (47.6mm)
3+
0.2"
1.0" (25.4mm)
(4.8mm)
0.95" (24.1mm)
RSS Dimensions
1.9" (48.26mm)
2.4" (6.96mm)
2.65" (67.31mm)
1.075"
(27.31mm)
0.79"
(20.07mm)
Material: Polycarbonate-Clear
0.5" (12.70mm)
0.37" (9.40mm)
RSS-CVR (finger-safe cover)
All dimensions in mm.
www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC E-39
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