Trane POP3 Control Circuit Tester Breaker 3 Amp

Product Description

The TRANE POP3 is a 3-amp control circuit tester breaker, commonly called the Lil Popper, used to test and protect low-voltage control circuits in HVAC systems. It functions as both a diagnostic tool and a protective device, allowing technicians to verify circuit integrity and prevent damage from shorts or overcurrent conditions on 24-volt control wiring. The POP3 is a compact inline device suited for field use by licensed HVAC technicians during commissioning, troubleshooting, and service calls.

The POP3 is designed for use on low-voltage control circuits typical in residential and light commercial HVAC systems. It is most commonly applied at the 24-volt secondary side of a control transformer to protect thermostats, contactors, and control boards from short-circuit damage. HVAC service technicians carry this device as a standard diagnostic aid when tracing wiring faults or verifying transformer output before energizing a control circuit.

Key Features

• 3-amp trip rating protects low-voltage control circuits from overcurrent damage
• Inline design allows quick insertion into a control circuit for live testing
• Resettable breaker function eliminates need for fuse replacement during diagnostics
• Compact form factor suited for field carry and repeated use

Compatibility

Designed as an OEM-style control circuit tester for use on standard 24-volt low-voltage HVAC control circuits in residential and light commercial systems.

Installation Notes

Installation and use of this device should be performed by a qualified HVAC technician familiar with low-voltage control wiring. Always de-energize the system and discharge capacitors before accessing control wiring or circuit boards. Insert the POP3 inline with the control circuit per the manufacturer instructions before re-energizing. Work performed on control circuits should comply with applicable local codes and NEC guidelines for low-voltage wiring.

Technical Specifications

• Trip Rating: 3 amps
• Circuit Type: Low-voltage control circuit

Standard Information

• Brand: TRANE
• Manufacturer Part Number: POP3