Primary and Secondary Injection Testing for low voltage circuit breakers

Primary and Secondary Injection Testing for low voltage circuit breakers

Overview:
This article provides customers with comprehensive guidance on industry-standard testing procedures for low-voltage circuit breakers, specifically focused on Primary and Secondary Injection Testing. These tests ensure that circuit breakers function reliably under fault and overload conditions, in compliance with NETA and ANSI/NEMA guidelines.

The content includes:

  • Primary Current Injection Testing for MCCBs: Covers inverse-time, instantaneous, and rated hold-in tests, equipment requirements, safety practices, and step-by-step testing methods.

  • Primary & Secondary Injection Testing for Ground Fault Protection: Explains how to simulate fault conditions using actual current or a relay tester, including both trip and no-trip test procedures.

This resource is ideal for field technicians, engineers, and service providers working with LS ELECTRIC circuit breakers.