---
product_id: 570087844
title: "Supco Tradefox Jumper King Bypass Low Voltage Thermostat to Activate The Circuit"
brand: "supco"
price: "$156.55"
currency: USD
in_stock: true
reviews_count: 12
category: "Supco"
url: https://www.desertcart.us/products/570087844-supco-tradefox-jumper-king-bypass-low-voltage-thermostat-to-activate
store_origin: US
region: United States of America
---

# 0-30V low voltage range Resettable fuse protection 20 interchangeable adapters Supco Tradefox Jumper King Bypass Low Voltage Thermostat to Activate The Circuit

**Brand:** supco
**Price:** $156.55
**Availability:** ✅ In Stock

## Summary

> ⚡ Master HVAC diagnostics with the ultimate low-voltage bypass tool!

## Quick Answers

- **What is this?** Supco Tradefox Jumper King Bypass Low Voltage Thermostat to Activate The Circuit by supco
- **How much does it cost?** $156.55 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/570087844-supco-tradefox-jumper-king-bypass-low-voltage-thermostat-to-activate)

## Best For

- supco enthusiasts

## Why This Product

- Trusted supco brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Organized:** Durable zip-up EVA case keeps all 20 ends and leads neatly stored for on-the-go pros.
- • **Built-In Safety Reset:** Resettable popper fuse prevents shorts, ensuring safe, uninterrupted testing.
- • **Hands-Free Convenience:** Magnets and fold-out hook let you work smarter, not harder, on multi-stage and heat pump units.
- • **Versatile Adapter Arsenal:** Includes 20 magnetic tips, alligator clips, spade connectors & insulation probes for every scenario.
- • **Effortless HVAC Circuit Activation:** Bypass any low voltage thermostat instantly to diagnose and troubleshoot with precision.

## Overview

The Supco Tradefox Jumper King is a professional-grade low voltage thermostat bypass tool designed for HVAC technicians. Operating safely within 0-30V circuits, it features 20 interchangeable adapters, a resettable fuse for short-circuit protection, and hands-free magnets/hooks. Ideal for fast troubleshooting of compressors, relays, and thermostat circuits on multi-stage and heat pump systems, it comes in a rugged zip-up case for organized field use.

## Description

Supco Tradefox's Jumper King Multi Jumper with Selector One hookup allows you to safely bypass any low voltage thermostat and activate the leads/circuit of your choice. Eliminates compressor short cycling and start the system safely when your ready to start it Innovative circuit selector switches to activate leads/circuits of your choosing at any timeResettable popper fuse - will never short outNo batteries required - powered by the low voltage in the A/C unitWorks on multi stage units including heat pumpsIncludes 20 interchangeable ends2 Spade Adapter6 Alligator Clamps6 Magnetic Tips6 Self Piercing Insulation Tips6 Jumper Leads1 Hard Zip-Up EVA Sectioned Case1 Jumper King Thermostat Bypass ToolEquipped with Magnets and Fold-Out Hook for Hands Free Work

Review: Trade Fox Low voltage bypass - Works great for bypassing HVAC thermostat.
Review: Well though out tool - Locating a low voltage short is one of the service calls an HVAC technician dreads. This tool enables the technician to send power from R to the components in the system by means of supplied switches. You can energize O, W, Y, or G. The built-in circuit breaker trips if there is a short. This narrows the search to O, Y, W or G. Comes with leads and handy clips that allow you to pierce the insulation, or small magnetic ends that can be used on some tstat sub bases. Makes the dread of Locating a short a bit less dreadful! This cannot be used on a system with a communicating tstat, as far as I know.

## Features

- Quickly bypass thermostats and activate HVAC circuits for fast troubleshooting and system diagnostics.
- Includes 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.
- Comes with 20 interchangeable ends and a durable zip-up carrying case for organized field service.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BHLMJNMR |
| Best Sellers Rank | #85,338 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #74 in Home Thermostat Accessories |
| Brand Name | Supco |
| Color | Orange |
| Customer Reviews | 4.8 4.8 out of 5 stars (282) |
| Item Weight | 0.78 Kilograms |
| Manufacturer | Supco |
| Measurement Type | Voltmeter |
| Minimum Operating Voltage | 1 Volts |
| Model | TFXJK |
| Power Source | Low Voltage |
| Specification Met | CE |
| UPC | 687152291489 |
| Upper Temperature Rating | 150 Degrees Fahrenheit |

## Product Details

- **Brand:** Supco
- **Color:** Orange
- **Item Weight:** 0.78 Kilograms
- **Min. Operating Voltage:** 1 Volts
- **Power Source:** Low Voltage

## Images

![Supco Tradefox Jumper King Bypass Low Voltage Thermostat to Activate The Circuit - Image 1](https://m.media-amazon.com/images/I/71Yc6CmPaaL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Trade Fox Low voltage bypass
*by A***R on March 22, 2026*

Works great for bypassing HVAC thermostat.

### ⭐⭐⭐⭐⭐ Well though out tool
*by D***. on April 19, 2025*

Locating a low voltage short is one of the service calls an HVAC technician dreads. This tool enables the technician to send power from R to the components in the system by means of supplied switches. You can energize O, W, Y, or G. The built-in circuit breaker trips if there is a short. This narrows the search to O, Y, W or G. Comes with leads and handy clips that allow you to pierce the insulation, or small magnetic ends that can be used on some tstat sub bases. Makes the dread of Locating a short a bit less dreadful! This cannot be used on a system with a communicating tstat, as far as I know.

### ⭐⭐⭐⭐⭐ Great tool addition
*by G***A on November 19, 2025*

Saves time and money. Love it

## Frequently Bought Together

- Supco Tradefox Jumper King Bypass Low Voltage Thermostat to Activate The Circuit
- HVAC Guys - The Fuse Saver | HVAC Circuit Tester | 3 AMP & 5 AMP Fuses | Fuse Tester for Circuit Breaker - UL Rated 24V AC/DC & 125/250V AC
- Supco FPRO100 Furnace Pro Switch Clip

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.us/products/570087844-supco-tradefox-jumper-king-bypass-low-voltage-thermostat-to-activate](https://www.desertcart.us/products/570087844-supco-tradefox-jumper-king-bypass-low-voltage-thermostat-to-activate)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-19*