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FOTEK SSR SERIES SOLID STATE RELAY SSR-40DA
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FOTEK SSR SERIES SOLID STATE RELAY SSR-40DA

Manufacturer: FOTEK
Model: SSR-40DA Solid State Relay
Input Voltage: 3–32 VDC (or 4–32 VDC)
Output: 24–380 VAC, 40 A max. (zero-cross switching)
Rated Load Current: 40 A
Housing: Epoxy-sealed plastic module with metal base plate, LED input indicator

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Product Description

The FOTEK SSR-40DA is one of the most widely used and affordable single-phase DC-to-AC solid state relays on the global market. With reliable zero-cross switching, high isolation (over 4 kV), and a generous 40 A rating, it is the go-to choice for industrial temperature control, heating elements, ovens, plastic machinery, packaging equipment, and any application requiring silent, long-life switching of resistive or inductive AC loads from low-voltage DC signals (PLC, Arduino, PID controllers, etc.). The built-in LED status indicator and screw terminals make installation fast and troubleshooting simple.

Standard Features

  • 40 A continuous rating: Handles heavy resistive loads up to ~9–10 kW @ 220–240 VAC without forced cooling (with heatsink recommended for full load).

  • Wide DC input range: 3–32 VDC control — directly compatible with most PLCs, microcontrollers, and PID controllers.

  • Zero-cross switching: Minimizes EMI and inrush current for longer load life.

  • High isolation & surge protection: >4 kV isolation, 1200 V peak blocking, 410 A surge current capability.

  • LED status indicator: Clearly shows when the relay is activated.

  • Cost-effective & reliable: Millions installed worldwide — proven in harsh industrial environments.

Technical Specifications

ParameterValue
TypeSingle-phase DC to AC Solid State Relay (Zero-cross)
Order NumberSSR-40DA
Input Control Voltage3–32 VDC (typical 4–32 VDC)
Turn-on Voltage>2.4–3 VDC
Turn-off Voltage<1.0–3.5 VDC
Trigger Current7.5–12 mA max. (at 12 VDC)
Output Load Voltage24–380 VAC (rms)
Rated Load Current40 A continuous
Surge Current (non-repetitive)410 A (one cycle)
Peak Blocking Voltage1200 V min.
Voltage Drop (on-state)≤1.6 V @ 25 °C
Switching TypeZero-cross
Isolation Voltage>4000 V rms (EN60950)
Insulation Resistance>100 MΩ @ 500 VDC
Operating Temperature–40 °C … +80 °C
Humidity35–85 % RH (non-condensing)
ConnectionScrew terminals
ApprovalsCE, CUS (some variants), RoHS

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