Why Does My MCB Keep Tripping? Causes and Fixes
A step-by-step diagnostic guide to why an MCB keeps tripping: overload, short circuit, earth fault, wrong tripping curve, an aging breaker, or a loose connection.
10 min read
Technical
Tripping guides
Guides and notes on industrial electrical and automation parts: selection, wiring, settings and ordering.
- Articles
- 6
- Latest
Why Does My Overload Relay Keep Tripping? Causes and Fixes
A field checklist for diagnosing repeat overload relay trips: dial setting versus FLC, trip class versus start time, genuine mechanical overload, phase loss, and reset-mode mistakes.
10 min read
Why Does My Phase Monitoring Relay Keep Tripping? Causes and Fixes
A troubleshooting guide to the real causes of repeat phase monitoring relay trips, from genuine phase loss and wrong rotation to voltage asymmetry, motor-starting sag, and hysteresis settings that are...
8 min read
Why Does My MPCB Keep Tripping? Causes and Fixes
MPCBs trip for one of two reasons — thermal overload or magnetic instantaneous trip — and this guide walks through diagnosing dial mismatch, trip-class mismatch, phase loss, mechanical drift, and...
9 min read
Why Does My RCD Keep Tripping? Causes and Fixes
A diagnostic walkthrough of RCD nuisance tripping: cumulative leakage current, RCD type mismatches, moisture faults, and when to replace the device instead of chasing a repair.
10 min read
Why Does My MCCB Keep Tripping? Causes and Fixes
A troubleshooting guide to diagnosing why an MCCB keeps tripping, separating overload, short-circuit, earth fault, and nuisance-trip causes.
10 min read
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