Details

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⚙️ General Description

The ESR‑DA Series is FOTEK’s line of high-power DC‑to‑AC SSRs. The ESR‑40DA model is the standard version (no integrated heatsink/fan) designed for three-phase or single loads controlled by a DC signal. 

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🔌 Input & Output Specifications

• Control Input (DC): 4–32 VDC

• Turn‑off Threshold: < 3 VDC

• Input Current: Max 30 mA

• Control Method: Zero-cross switching (minimizes electrical noise) 

• Load Voltage (AC): 24–380 VAC

• Max Continuous Current: 40 A

• Surge Withstand:

  • Surge Current: ~410 A

  • I²t (fuse rating): ~664 A²·s

• Leakage Current: ~5 mA when OFF

• Response Time: ~8.3 ms (for 60 Hz systems) 

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🛡️ Protection & Durability

• Overheat Protection: Built-in thermal cutoff at ≈120 °C; auto‐resets below ≈110 °C 

• Dielectric Strength: ≥ 4 kVrms

• Insulation Resistance: ≥ 100 MΩ at 500 VDC 

• EMC Immunity: 2 kV surge protection per EN61000‑4‑4 

• Safety Approvals: Conforms to EN60947‑4‑3 and EN60950 

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📐 Environmental & Mechanical Details

• Operating Temp & Humidity: –40 °C to +80 °C; 35–85 % RH 

• Construction: Robust module designed for industrial setups; mounting options vary by accessory selections.

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✅ Use Cases

Ideal for:

• Switching mid-power three-phase/single-phase AC loads (heaters, motors, etc.)

• Applications requiring silent, spark-free operations and EM interference reduction

• Industrial automation systems controlled by PLCs or microcontrollers

Thermal protection and high dielectric rating make it reliable in heavy‑duty environments.

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🔄 Upgrades & Alternatives

• For applications demanding higher output voltage ranges (up to 480 VAC), consider the ESR‑40DA‑H model.

• If you need integrated cooling and overload protection, the ESR‑40DA+ version includes fuse, heatsink, and fan.