SUPCO
SUPCO 3W3 Hard Start Kit hvac control 208 to 240V 270-324 MFD 4-5 ton
Hard-start kit with mechanical potential relay and 270-324 MFD capacitor for 4-5 ton reciprocating or scroll compressors on 208-240 V systems
- Reduces compressor start stress with 270-324 MFD capacitor
- Handles 4-5 ton reciprocating and scroll compressors
- Operates on 208-240V AC control voltage
- Mechanical potential relay enables instant restart
- Pick-up 180-195V, drop-out 40-105V range
SUPCO 3W3 Hard Start Kit 4-5 ton
The SUPCO 3W3 Hard Start Kit is designed for HVAC technicians servicing reciprocating or scroll compressors rated between 4 and 5 horsepower. It provides a mechanical potential relay and start capacitor to assist compressor starting on 208 to 240V AC single-phase systems.
Includes EZ Clamp Bracket for mounting
The kit bundles an EZ Clamp Bracket that simplifies securing the relay and capacitor assembly inside the electrical enclosure. This bracket reduces installation time by eliminating the need for separate mounting hardware or adhesive solutions.
Mechanical potential relay
The relay operates on a control voltage range of 208 to 277V AC with a pick-up voltage of 180 to 195V and a drop-out voltage of 40 to 105V. The three-wire configuration and instant restart capability support reliable day-to-day operation in residential and light commercial cooling equipment.
Highlights
- Reduces compressor start stress with 270-324 MFD capacitor
- Handles 4-5 ton reciprocating and scroll compressors
- Operates on 208-240V AC control voltage
- Mechanical potential relay enables instant restart
- Pick-up 180-195V, drop-out 40-105V range
Specifications
| Brand | SUPCO |
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Questions about this item
How often will the start capacitor rated 270-324 MFD need replacement under normal cycling?
The capacitor is a wear component; plan to inspect it during annual HVAC service and replace it if capacitance drifts outside the 270-324 MFD range or if the compressor struggles to start.
What is the first limit reached when the compressor runs continuously at 5 hp on 240 V?
The potential relay’s drop-out voltage of 40 to 105 V defines the lower operating boundary; sustained low-line conditions that push voltage toward that range will disengage the start winding first.
How much heat does the mechanical potential relay generate during all-day operation?
The relay itself produces minimal heat; the main thermal load comes from the compressor windings, and the kit’s EZ Clamp bracket helps dissipate that heat through the mounting surface.
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