ENMG / SOLID-STATE RELAYS
SO
Single-phase AC solid-state relays
Optically isolated zero-cross solid-state relays for switching AC loads from DC control signals, with multiple current and voltage classes.
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Specifications & selection.
- SO94: 12–280 VAC; SO96: 24–600 VAC.
- Published DC-input selections from 12 A to 125 A; heat sinking and load derating are required.
- Covered screw terminals, plated aluminum base and DBC thermal substrate described by the source.
| Model | AC load range | Maximum current class | Peak voltage | Control input |
|---|---|---|---|---|
| SO941480 | 12–280 VAC | 12 A | 600 V | 3–32 VDC |
| SO942480 | 12–280 VAC | 25 A | 600 V | 3–32 VDC |
| SO943480 | 12–280 VAC | 35 A | 600 V | 3–32 VDC |
| SO965480 | 24–600 VAC | 50 A | 1200 V | 3.5–32 VDC |
| SO967480 | 24–600 VAC | 75 A | 1200 V | 3.5–32 VDC |
| SO968480 | 24–600 VAC | 95 A | 1200 V | 3.5–32 VDC |
| SO969480 | 24–600 VAC | 125 A | 1200 V | 3.5–32 VDC |
| Parameter | Specification |
|---|---|
| Control current | 10–30 mA |
| OFF leakage | Maximum 5 mA at rated voltage |
| ON-state drop | 1.5 V |
| Trigger | Zero cross |
| Ambient | −30 to +40 °C |
| Dielectric withstand | 2500 VAC, 1 minute, 50/60 Hz |
| Insulation resistance | Text: 500 MΩ at 500 VDC; image prints mΩ — confirm unit |
| Source general working-current factors | Resistive: 50%; inductive: 15% of rating |
| Protection code | 8: RC; 9: RC + VDR + Transil; confirm available combinations |
| Other input code | 9: 20–265 VAC/DC option; not the DC quick-selection models above |
| Load | Factor of rated output current |
|---|---|
| Pure resistance | 0.6 |
| Heating wire | 0.5 |
| Incandescent lamp | 0.4 |
| Electromagnet | 0.25 |
| Transformer | 0.25 |
| Single-phase motor | 0.15 |
| Item | Information |
|---|---|
| A1 / A2 | Control positive / negative |
| L1 / T1 | AC supply input / load output |
| Illustrated body, H × W × depth | 59 × 45 × 29 mm; representative drawing only |
| Terminal-center annotations | 26 mm across; 44 mm vertically; not verified mounting-hole pitch |
| Mounting / mass | Screw fixing to heat sink or mounting plate; mass not specified |
Selection & installation notes
- Use a heat sink above 10 A as required by the source, with thermal interface compound and adequate airflow. Verify thermal design at all loads; consider forced air when the heat-sink surface approaches 60 °C.
- The source general derating factors conflict with parts of the load-specific table. Confirm the required rating from actual inrush and thermal conditions rather than applying a less conservative factor automatically.
- OFF-state leakage means the load is not electrically isolated. Disconnect the main supply before service.
- The representative gallery photograph shows SO863970 with AC/DC input; use the exact SO94/SO96 quick-selection code and datasheet for a DC-input order.
- The catalogue title mentions dual-channel versions, but the supplied technical table describes single-phase units with A1/A2 and L1/T1. No dual-channel ratings are inferred.
- Confirm terminal torque, wire range and certified outline before installation. Zero-cross switching does not eliminate every type of load inrush.
Based on the official Chinese product page and selection charts ↗. Checked 2026-09-15. Confirm the current specification for the exact model when ordering.
TECHNICAL RESOURCES
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ENMG relays — English product-family brochure.
This is a product-family brochure. Request a model-specific datasheet and installation drawing with your inquiry.