Solid state relays (PTC start relays) for refrigerator & freezer compressors. SH series, 4-pin, 1/20–1/3 HP, 3.5–10A. Use with or without run capacitor. No moving contacts, long life. OEM & ODM. Free samples.
Solid state start relay (PTC relay) for single-phase refrigeration compressors. SH series 4-pin design, 1/20–1/3 HP, 3.5–10A. No mechanical contacts, no wear, high reliability. Can be used with or without run capacitor. Compact plug-on mounting for refrigerators, freezers, water coolers. OEM support.
| Parameter | Details |
|---|---|
| Product Type | Solid State Relay (PTC Start Relay) |
| Series | SH Series |
| Relay Type | PTC solid state |
| Number of Pins | 4 |
| Applicable Power | 1/20 HP – 1/3 HP |
| Current Range | 3.5A – 10A |
| Voltage | 115V / 230V AC |
| Frequency | 50/60 Hz |
| Run Capacitor | Can be used with or without |
| Mounting | Plug-on type for compressor terminals |
| Construction | Solid state, no moving contacts |
| Operating Temperature | -40°C to +70°C |
| Compatible Refrigerants | R134a, R600a, R22 |
| Application | Refrigerator, freezer, water cooler, vending machine |
Solid State Reliability – No moving contacts, no mechanical wear, no arcing. Eliminates contact sticking and welding common in mechanical relays, ensuring consistent compressor starting over a long service life.
PTC Self-Regulating – The PTC element automatically increases resistance after startup, reducing current to the start winding without external control. This simplifies system design and improves reliability.
Compatible with Run Capacitors – Can be used in systems with or without run capacitors, offering flexibility in compressor design and reducing the number of relay variants needed for different applications.
Wide Current Range – 3.5A to 10A covers 1/20 to 1/3 HP compressors, suitable for refrigerators, freezers, water coolers, and vending machines. One relay series covers a broad range of small compressors.
Compact 4-Pin Design – Plug-on mounting for quick installation on compressor terminals, reducing assembly time on the production line and simplifying field replacement.
Long Service Life – No mechanical parts to wear out, providing long electrical life and reducing service callbacks. Ideal for sealed-system refrigeration equipment where reliability is critical.
Stable Bulk Supply – Standard models ship in 15–25 days, supporting rolling replenishment and reducing inventory capital occupation.
OEM & ODM Support – Custom logo, packaging, terminal type, and voltage available. Can produce according to customer specifications.
Batch Traceability – MTC with every shipment; SGS/BV third-party inspection supported.
Export Packaging – Seaworthy carton and pallet packaging, suitable for long-distance ocean shipping.
For technical datasheets, samples, or bulk pricing, contact us directly.
Send your specifications (HP, current, voltage, terminal type) for a free technical evaluation and quotation within 24 hours. OEM and ODM orders welcome.
