Supco Tradefox Jumper King Bypass: Activate HVAC Circuits Without a Thermostat

Overview

The Supco Tradefox Jumper King is a field-ready bypass tool that lets you safely bypass a low voltage thermostat and energize the leads or circuit you choose. It runs off the unit’s own low voltage, so no batteries are required, and it includes a resettable fuse for protection.

Designed for modern HVAC setups, including multi-stage units and heat pumps, it helps technicians test compressors, relays, contactors, and thermostat circuits with confidence. A strong magnet and fold-out hook help you work hands-free while you probe connections.

Key capabilities

• Quickly bypass thermostats and activate HVAC circuits for fast troubleshooting and diagnostics.
• Interchangeable adapters such as magnetic tips, alligator clips, spade connectors, and self-piercing insulation probes.
• Ideal for testing compressors, relays, contactors, and thermostat circuits during AC or heat pump service.
• Designed for use on 0–30V HVAC control circuits with built-in resettable fuse protection.
• Includes 20 interchangeable ends and a durable zip-up carrying case for organized field service.

What’s in the kit

• 20 interchangeable ends for wide compatibility
• 2 spade adapters for secure terminations
• 6 alligator clamps for solid connections
• 6 magnetic tips for hands-free setup
• 6 self-piercing insulation tips for quick access
• 6 jumper leads to reach distant circuits
• 1 hard zip-up EVA case for organization
• 1 Jumper King thermostat bypass tool with magnets and fold-out hook

Whether you are diagnosing a non-starting compressor or confirming a relay click, this tool makes it easier to isolate the cause without disrupting the overall system. Use it with care and follow standard safety practices in the field.