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Main · Emergency · Power management
Switchboard (MSB / ESB / PMS)
Main switchboard, emergency switchboard, ACB primary injection, PMS load-sharing, blackout recovery, bus-tie discrimination.
Service available at all US ports — 24/7 worldwide. Our next available technician contacts you within 1 hour.
Symptom checklist
What we hear from the bridge.
- ›Bus-tie ACB trips on overcurrent during heavy consumer start
- ›PMS fails to start next priority generator at 85% load
- ›Shore power connection trips at cold-ironing berth
- ›Insulation alarm on 440V bus, IR drops below 0.5 MΩ
- ›ACB long-time pickup outside ±10% of nameplate (IEC 60947-2)
- ›Blackout recovery sequence does not restart aux machinery
Likely root causes
Where the fault usually lives.
- ›Aged Terasaki AR/AT ACB closing coil or UV release out of tolerance
- ›Loose busbar bolt torque, partial discharge on insulator stand-offs
- ›PMS load-share CT phase reversed after maintenance
- ›Earth-fault path in starboard 220V lighting feeder
Equipment we bring
Calibrated test equipment, class-acceptable reports.
- SVERKER 900 primary injection (0–3000 A)
- OMICRON CMC 356 secondary injection
- Megger MIT525 5kV insulation tester
- FLIR T540 thermography
- Doble F6150e protection relay test set
Reports compatible with DNV · BV · ABS · Lloyd's · TL · RINA · ClassNK · IRS.
Often needed together
Parts most often requested with this service.
- acb trip units
- schneider coils
- deif relays
- pms cards
FAQ
Common questions for this system.
- Do we run ACB primary injection on board?
- Yes — SVERKER 900 primary injection set (3000 A capability, 5000 A for larger bus-tie breakers). Captures long-time, short-time, instantaneous and ground-fault pickup against the nameplate trip curve per IEC 60947-2.
- Which switchboard makers do we cover?
- Terasaki AR/AT, ABB Emax 2 marine, Schneider Masterpact NW, Siemens 3WL, Mitsubishi marine ACBs. PMS platforms: DEIF AGC-4, Selco T2000, Woodward 2301D and DPG. Trip unit replacements sourced through approved channels.
- Can we attend the Special Survey alongside the surveyor?
- Yes — and this is the recommended setup for vessels with complex automation or HV installations. The ETO answers the surveyor's questions on the spot, runs the supporting tests in real time, and produces the class-acceptable report before the surveyor leaves.
Have a vessel calling?
Three quick questions — port, when, contact. Our next available technician will contact you within 1 hour.