ICP 2-Pole Contactor for RGS121HDCB0AAA — 30A/40A 24V Coil | Ships Today
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Overview
This is a genuine OEM 2-pole definite purpose contactor for the ICP / Heil / Tempstar RGS121HDCB0AAA system, available in 30-amp (OEM 1178074) and 40-amp (OEM 1178211) ratings, both with a 24-volt control coil. The contactor is the electromechanical switch that energizes the compressor and condenser fan motor whenever the thermostat calls for cooling. When 24V is applied to the coil, the magnetic field pulls the contacts closed, sending line voltage to the high-amperage loads. Over thousands of cycles the contacts pit, burn, and weld, and the coil can lose its pull — leaving you with a unit that hums, chatters, won't start, or refuses to shut off. Replacing a worn contactor restores clean, reliable switching and protects the more expensive compressor downstream.
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1178074 (30A), 1178211 (40A) |
| Type | Definite Purpose Contactor |
| Brand | ICP / Heil / Tempstar |
| Poles | 2-Pole |
| Contact Rating | 30A / 40A |
| Coil Voltage | 24 VAC |
| Fitment | OEM Replacement |
Compatibility
Engineered as a direct OEM replacement for the ICP / Heil / Tempstar RGS121HDCB0AAA. The 2-pole, 24V-coil design is also common across many ICP-family gas furnace and condensing unit platforms. Always confirm the amp rating and coil voltage against the part you are removing before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and the local disconnect, then verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the service/electrical panel to expose the contactor.
- Document — Photograph every wire and terminal before disconnecting anything.
- Remove — Note the line (L1/L2), load (T1/T2), and 24V coil terminals, transfer wires one at a time, and unbolt the old contactor from its bracket.
- Install — Mount the new contactor and reconnect each wire to the matching terminal per your photos.
- Test — Restore power, call for cooling, and confirm the contacts pull in cleanly with no chatter or buzzing.
Signs You Need a Replacement
- Loud humming, buzzing, or chattering at the contactor.
- Pitted, blackened, or welded contacts visible on inspection.
- Compressor/condenser fan won't start, or won't shut off after the call ends.
- Burnt-plastic smell or scorch marks around the contactor body.
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days