ABB MNS-MCC Error Code E-113

ABB Electrical Major Breaker

Model: MNS-MCC | Code: E-113

Applicable Systems
MNS-MCC

Symptoms

The main circuit breaker has failed to close after a trip. The operating mechanism does not latch and the breaker handle springs back to the tripped position.

Possible Causes

  • Breaker mechanism spring broken or fatigued, preventing latching
  • Trip unit internal fault causing the breaker to immediately re-trip on close
  • Mechanical binding in the linkage due to lack of lubrication or corrosion
  • Breaker contacts welded from interrupting a large fault current

Troubleshooting Steps

  1. Step 1: Attempt to charge the breaker spring mechanism using the manual charging handle
    If the mechanism does not charge, the spring is broken; replace the breaker
  2. Step 2: If the mechanism charges but does not latch on close, inspect the trip linkage
    Look for bent, worn, or missing linkage components
  3. Step 3: Use the breaker test function to attempt a no-load close
    If the breaker trips immediately, the trip unit may be faulty; try resetting the trip unit
  4. Step 4: If the contacts are welded, the breaker cannot be safely reused
    Replace the breaker; do not attempt to force welded contacts apart

How to Reset

Reset: After the mechanism is repaired or the breaker is replaced, reset the trip unit and close the breaker.

Common Replacement Parts

  • Circuit breaker: Molded-case or air-frame type (Match frame size, interrupting rating, and trip unit)
  • Breaker lubricant: OEM-specified grease (Do not use petroleum-based grease on plastic components)
  • Trip unit: Microprocessor or thermal-magnetic (Match to existing breaker model)

Frequently Asked Questions

  • Q: How many operations is a breaker rated for?

    Molded-case breakers typically rated for 10,000 mechanical operations. Air-frame breakers: 5,000. Track operation counts for predictive maintenance.

  • Q: What causes welded contacts?

    Interrupting a fault current larger than the breaker's interrupting rating, or slow clearing time allowing the arc to persist and weld the contacts.

  • Q: Can I service a breaker mechanism?

    On air-frame breakers, yes, with OEM service kits. On molded-case breakers, the mechanism is sealed and the breaker must be replaced.

Related ABB Fault Codes

Source: OEM Technical Manual

Category: Electrical