2 / 3-Phase SSR with Detachable / Integrated Heatsink

SR2 / SR3 / SRH2 / SRH3 Series

Instruction Manual

Safety Considerations

Observe all 'Safety Considerations' for safe and proper operation to avoid hazards. ⚠️ symbol indicates caution due to special circumstances in which hazards may occur.

Warning

Failure to follow instructions may result in serious injury or death.

01. Install a fail-safe device when using the unit with machinery that may cause serious injury or substantial economic loss (e.g., nuclear power control, medical equipment, ships, vehicles, railways, aircraft, combustion apparatus, safety equipment, crime/disaster prevention devices, etc.). Failure to follow this instruction may result in personal injury, economic loss or fire.
02. Do not use the unit in places where flammable/explosive/corrosive gas, high humidity, direct sunlight, radiant heat, vibration, impact, or salinity may be present. Failure to follow this instruction may result in explosion or fire.
03. Install the unit on a DIN rail or panel. Failure to follow this instruction may result in fire or electric shock.
04. Do not connect, repair, or inspect the unit while it is connected to a power source. Failure to follow this instruction may result in fire or electric shock.
05. Check 'Connections' before wiring. Failure to follow this instruction may result in fire.
06. Do not disassemble or modify the unit. Failure to follow this instruction may result in fire or electric shock.

Caution

Failure to follow instructions may result in injury or product damage.

01. Use the unit within the rated specifications. Failure to follow this instruction may result in fire or product damage.
02. Use a dry cloth to clean the unit; do not use water or organic solvent. Failure to follow this instruction may result in fire or electric shock.
03. Keep the product away from metal chips, dust, and wire residue that may flow into the unit. Failure to follow this instruction may result in fire or product damage.
04. Since leakage current still flows right after turning off the power or in the output OFF status, do not touch the load terminal. Failure to follow this instruction may result in electric shock.

Cautions during Use

Follow instructions in 'Cautions during Use'. Otherwise, it may cause unexpected accidents.

4 - 30 VDC and 24 VAC models require insulated, limited voltage/current, or Class 2, SELV power supply devices.
Attach a heatsink or install the unit in a well-ventilated place. For heatsink attachment, use Thermal Grease such as GE TOSHIBA (YG6111), KANTO-KASEI (FLOIL G-600), or SHINETSU (G746), or equivalent.
Ground the heatsink, panel, or DIN rail. Failure to follow this instruction may result in electric shock.
While supplying power to the load or right after turning off the power of the load, do not touch the body and heatsink. Failure to follow this instruction may result in burns due to high surface temperature.
To protect the product from the load's short-circuit current, use a rapid fuse with an I²t value less than half of the SSR's I²t. If short-circuited, replace the fuse with one of the same specification.
Install a dummy resistance in parallel with the load to ensure the sum of current flowing through the load and dummy resistance exceeds the SSR's minimum load current.
When using a random turn-on model for phase control, install a noise filter between the load and the power source.
Do not use near equipment that generates strong magnetic force or high-frequency noise.
This unit may be used in the following environments: Indoors (within rated 'Specifications'), Altitude max. 2,000 m, Pollution degree 2, Installation category III.

Ordering Information

This is for reference only; the actual product does not support all combinations. For specific model selection, refer to the Autonics website.

Model Naming Convention: SR ❶ ❷ - ❸ ❹ ❺ ❻

Parameter	Description
❶ Type	No mark: detachable heatsink; H: Integrated heatsink
❷ Number of the control phase	2: 2-phase; 3: 3-phase
❸ Rated input voltage	1: 4 - 30 VDC; 2: 24 VAC; 4: 90 - 240 VAC
❹ Rated load voltage	2: 24 - 240 VAC; 4: 48 - 480 VAC
❺ Rated load current (resistive load)	Number: rated load current (unit: A)
❻ Function	No mark: Zero cross turn-on; R: Random turn-on

Product Components

Product
Instruction manual

Dimensions

Unit: mm. For detailed drawings, refer to the Autonics website.

Indicators: A - Input indicator (green), B - Alarm indicator (red).

Detachable heatsink type

Overall dimensions approximately 109 mm (height) x 97 mm (width) x 75.5 mm (depth). Features four Ø 5.2 mm mounting holes and four R2.6 mm corner radii.

Integrated heatsink type

For rated load current 15 / 30 / 40 A: Overall dimensions approximately 130 mm (height) x 103 mm (width) x 112.7 mm (depth). Features two Ø 4.5 mm mounting holes and mounting screw locations.

For rated load current 50 A: Overall dimensions approximately 144 mm (height) x 132 mm (width) x 132.2 mm (depth). Features two Ø 4.5 mm mounting holes.

For rated load current 75 A: Overall dimensions approximately 144 mm (height) x 132 mm (width) x 132.2 mm (depth). Features two Ø 4.5 mm mounting holes.

Panel cut-out

Detachable heatsink type: Requires a panel opening of approximately 97 mm x 92 mm with 8-M5 screw holes.

Integrated heatsink type (15 / 30 / 40 A): Requires a panel opening of approximately 103 mm x 90 mm with 4-M4 screw holes.

Integrated heatsink type (50 A): Requires a panel opening of approximately 132 mm x 65 mm with 4-M4 screw holes.

Integrated heatsink type (75 A): Requires a panel opening of approximately 132 mm x 115 mm with 4-M4 screw holes.

Cooling fan mounting hole

For rated load current 30 / 40 A: Four Ø 3.2 mm holes spaced 71.5 mm apart.

For rated load current 50 / 75 A: Four Ø 3.4 mm holes spaced 82.5 mm apart.

DIN rail bracket: Provided for mounting on standard DIN rails.

Cautions during Installation

High Temperature

Caution: While supplying power to the load or right after turning off the power, do not touch the body and heatsink. Failure to follow this instruction may result in burns due to high surface temperature.

Spacing

When installing multiple SSRs, ensure adequate space between them for heat radiation.
When installing SSRs horizontally (input and output parts at the same height), supply less than 50% of the rated load current.

Specifications of cooling fan

Autonics does not provide cooling fans; purchase separately.

Load capacity	Cooling fan type	Size	Rated air flow (m³/min)	Rated air flow (CFM)
30 / 40 A	AC Fan	80 × 80 mm	0.68	24.0
30 / 40 A	DC Fan	80 × 80 mm	1.25	44.0
50 / 75 A	AC Fan	92 × 92 mm	1.13	40.0
50 / 75 A	DC Fan	92 × 92 mm	1.80	63.5

Note: The cooling fan should exceed the rated air flow value.

Grounding

Be sure to ground the mounting bolts.

Connections

For DC signal input models, terminals 8 and 10 are connected internally. For AC signal input models, terminals 8 and 10 are insulated internally.

2-phase

Diagram Description: Shows a 2-phase SSR connection. Input power (DC or AC) is supplied to input terminals (e.g., 7/A1+, 8/A2-). A rapid fuse is connected in series with the load. The SSR has input circuit and overheating detection circuit. The load is connected to output terminals (e.g., 1/L1, 2/T1, 3/L2, 4/T2). An alarm output (NPN open collector output) is available via terminals 9/AL+ and 10/AL-.

3-phase

Delta connection (△ connection)

Diagram Description: Similar to the 2-phase connection but adapted for three phases (R, S, T) connected to output terminals (1/L1, 2/T1; 3/L2, 4/T2; 5/L3, 6/T3). Input power, rapid fuse, input circuit, overheating detection circuit, load, and alarm output are connected as described for the 2-phase model.

Star connection (Y connection)

Diagram Description: Also adapted for three phases (R, S, T) connected to output terminals. The connection diagram shows the typical star configuration for a 3-phase load. Input power, rapid fuse, input circuit, overheating detection circuit, load, and alarm output are connected as described for the 2-phase model.

Cautions for Wiring

Unit: mm. When connecting wires to the terminals, use round crimp terminals.

Size	Input	Output
a	≥ 3.5 mm	≥ 5.0 mm
b	≤ 7.0 mm	≤ 12.0 mm

Specifications

Input

Parameter	4 - 30 VDC	24 VAC (50/60 Hz)	90 - 240 VAC (50/60 Hz)
Rated input voltage range	4 - 30 VDC	24 VACrms	90 - 240 VACrms
Allowable input voltage range	4 - 32 VDC	19 - 26.4 VACrms	85 - 264 VACrms
Max. input current	25 mA	15 mA	25 mA
Operating voltage	≥ 4 VDC	≥ 19 VACrms	≥ 85 VACrms
Releasing voltage	≤ 1 VDC	≤ 4 VACrms	≤ 10 VACrms
Operating time (Zero cross turn-on)	≤ 0.5 cycle of load power + 1 ms	≤ 1.5 cycle of load power + 1 ms	≤ 1.5 cycle of load power + 1 ms
Operating time (Random turn-on)	≤ 1 ms	-	-
Releasing time	≤ 0.5 cycle of load power + 1 ms	≤ 1.5 cycle of load power + 1 ms	≤ 1.5 cycle of load power + 1 ms

Output (24 - 240 VAC)

Parameter	15 Arms	30 Arms	50 Arms	75 Arms
Rated load voltage range	24 - 240 VACrms (50/60 Hz)
Allowable load voltage range	24 - 264 VACrms (50/60 Hz)
Rated load current (Resistive load, AC-51)	15 Arms	30 Arms	50 Arms	75 Arms
Min. load current	0.15 Arms	0.2 Arms	0.5 Arms	0.5 Arms
Max. 1 cycle surge current (60 Hz)	250 A	400 A	1000 A	1000 A
Max. non-repetitive surge current (I²t, t = 8.3 ms)	340 A²s	1000 A²s	4000 A²s	4000 A²s
Peak voltage (non-repetitive)	600 V
Leakage current (Ta = 25 ℃)	≤ 10 mArms (240 VAC/60 Hz)
Output ON voltage drop (max. load current)	≤ 1.6 V
Static off state dv/dt	500 V/µs

Output (48 - 480 VAC)

Parameter	15 Arms	30 Arms	40 Arms	50 Arms	75 Arms
Rated load voltage range	48 - 480 VACrms (50/60 Hz)
Allowable load voltage range	48 - 528 VACrms (50/60 Hz)
Rated load current (Resistive load, AC-51)	15 Arms	30 Arms	40 Arms	50 Arms	75 Arms
Min. load current	0.5 Arms
Max. 1 cycle surge current (60 Hz)	300 A	500 A	500 A	1000 A	1000 A
Max. non-repetitive surge current (I²t, t = 8.3 ms)	350 A²s	1000 A²s	1000 A²s	4000 A²s	4000 A²s
Peak voltage (non-repetitive)	1200 V (zero cross turn-on), 1000 V (random turn-on)
Leakage current (Ta = 25 ℃)	≤ 10 mArms (480 VAC/60 Hz)
Output ON voltage drop (max. load current)	≤ 1.6 V
Static off state dv/dt	500 V/µs

Alarm output (overheat prevention function)

Parameter	4 - 30 VDC	24 VAC (50/60 Hz)	90 - 240 VAC (50/60 Hz)
Load voltage	≤ 30 VDC	≤ 30 VDC	≤ 30 VDC
Load current	≤ 100 mA	≤ 50 mA	≤ 50 mA
Turn-off time	≤ 20 ms	≤ 40 ms	≤ 40 ms

Note: The overheat prevention function cuts off the load output when the SSR internal temperature is too high, preventing internal device damage. The alarm indicator and alarm output also turn ON.

General specifications

Dielectric strength (Vrms): 2500 VAC (50/60 Hz) for 1 min (input-output, input/output-case) for 15/30 A models (24-240 VAC); 4000 VAC (50/60 Hz) for 1 min (input-output, input/output-case) for 50/75 A models (24-240 VAC); 4000 VAC (50/60 Hz) for 1 min (input-output, input/output-case) for 48-480 VAC models.
Insulation resistance: ≥ 100 MΩ (500 VDC megger) (input-output, input/output-case).
Indicator: Input indicator (green), alarm indicator (red).
Vibration: 0.75 mm double amplitude at 10 to 55 Hz (for 1 min) in each X, Y, Z direction for 1 hour.
Vibration (malfunction): 0.5 mm double amplitude at 10 to 55 Hz (for 1 min) in each X, Y, Z direction for 10 min.
Shock: 300 m/s² (≈ 30 G) in each X, Y, Z direction for 3 times.
Shock (malfunction): 100 m/s² (≈ 10 G) in each X, Y, Z direction for 3 times.
Ambient temperature: -30 to 80 ℃ (for 90 - 240 VAC input: -30 to 70 ℃); storage: -30 to 100 ℃ (no freezing or condensation).
Ambient humidity: 45 to 85%RH; storage: 45 to 85%RH (no freezing or condensation).
Input terminal connection / alarm output terminal connection: ≥ 1×0.5 mm² (1×AWG 20), ≥ 1×1.5 mm² (1×AWG 16) or ≤ 2×1.5 mm² (2×AWG 16).
Output terminal connection: ≥ 1×1.5 mm² (1×AWG 16), ≥ 1×16 mm² (1×AWG 6) or ≤ 2×6 mm² (2×AWG 10).
Input terminal fixed torque: 0.75 to 0.95 N m.
Output terminal fixed torque: 1.6 to 2.2 N m.
Approvals: UL, CE, CSA, IEC.

Weight (packaged)

Type	Weight (approx.)
Detachable heatsink type	275 g (365 g)
Integrated heatsink type (15 / 30 / 40 A)	686 g (896 g)
Integrated heatsink type (50 A)	1268 g (1508 g)
Integrated heatsink type (75 A)	2064 g (2354 g)

SSR Derating Curve

The heatsinks for these curves are dedicated for the SRH2/SRH3 series. For SR2/SR3 series, install on a metal plate (min. 130 × 120 mm). Be aware that ambient temperature and derating curves differ based on the rated input voltage. When installing multiple SSRs, ensure space between them for heat radiation. For horizontal installation, supply less than 50% of the rated load current. SSR derating curves are approved by UL certification authority.

SR(H)2 / SR(H)3-1215

Graph showing Load Current [A] on the Y-axis versus Ambient Temperature [℃] on the X-axis. It displays two curves: 'With heatsink' and 'Without heatsink', indicating that the maximum allowable load current decreases as the ambient temperature rises.

SR(H)2 / SR(H)3-1415 / 1415R / 2415

SR(H)2 / SR(H)3-4215

SR(H)2 / SR(H)3-4415

SR(H)2 / SR(H)3-1230

Graph showing Load Current [A] on the Y-axis versus Ambient Temperature [℃] on the X-axis. It displays three curves: 'With heatsink+Cooling fan', 'With heatsink', and 'Without heatsink', indicating that the maximum allowable load current decreases as the ambient temperature rises. The 'With heatsink+Cooling fan' curve allows the highest load current, followed by 'With heatsink', and then 'Without heatsink'.

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