Altech 1g20um 20A 1-pole Thermal Magnetic Circuit Breaker

Product Description

The ALTECH 1g20um is a single-pole, thermal magnetic miniature circuit breaker rated at 20 amps and 277 volts, designed for industrial and commercial control panel applications. Part of the V-EA Series, this breaker uses a G trip curve with a 100 ms trip time to deliver application-specific overcurrent and short-circuit protection. It mounts to standard DIN rail and uses screw terminations for reliable, tool-accessible wiring. Licensed electricians and panel builders install this breaker in motor control centers, machine control panels, and distribution enclosures where current-limiting protection is required as a direct alternative to fused systems.

The 1g20um is suited for use in single-phase branch circuit and control circuit applications operating at up to 277 volts. Its G characteristic trip curve provides a protection profile appropriate for loads with moderate inrush characteristics. The V-EA Series supports a broad range of accessories including shunt trips, auxiliary contacts, alarm contacts, undervoltage release, and busbars, making it adaptable to complex panel configurations in both new construction and retrofit installations.

Key Features

• 20A current rating with 277-volt capacity for single-phase branch and control circuits
• G trip curve delivers application-specific overcurrent protection at 100 ms trip time
• Thermal magnetic operating mechanism provides both overload and short-circuit protection
• DIN rail mounting simplifies panel layout and reduces installation time
• Screw termination ensures secure, inspectable wire connections
• Compatible with a wide range of V-EA Series accessories for expanded functionality

Compatibility

Designed for use within the ALTECH V-EA Series platform, which supports shunt trips, auxiliary contacts, alarm contacts, undervoltage release modules, and busbars as add-on accessories.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the NEC and applicable local codes. De-energize the panel and verify the absence of voltage before installing or removing the breaker. Screw terminals should be tightened using an appropriate insulated screwdriver; do not overtighten. Confirm the selected trip curve and ampere rating match the load requirements before energizing.