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ABB Marine

UniGear ZS1 200A 440V

Emergency Switchboard (ESB) · Power Distribution

Class-certified type (DNV register) · technical data sheet not yet verified​‌‌​‌‍​‍​‍⁠‍‌‌​‍​⁠‌‌

ABB Marine UniGear ZS1 200A 440V — Power Distribution.

Specifications

Technical data.reference — unverified

Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.

Rated Current (A)200
Busbar Rating (A)200
Short-Circuit Rating (kA)25
Enclosure IP RatingIP44
Sections2
Inspection

Inspector Detail

Common issues

  • Loose busbar or cable lug connections leading to hot spots and increased contact resistance
  • Circuit breaker contact wear/pitting from repeated interruption of load or fault current
  • Protection relay settings drifting out of coordination with the main switchboard over time
  • Insulation degradation from moisture/condensation ingress in the machinery space
  • Automatic changeover/failure-to-start logic not correctly re-tested after emergency generator work
  • Indicator lamp or instrument transformer failure giving false status readings
  • Terminal corrosion in a humid engine room or emergency generator room environment

Inspection checklist

  • Thermographic (IR) scan of busbars, breaker connections and cable terminations under load
  • Verify emergency generator auto-start and auto-changeover sequence and timing against the SOLAS requirement
  • Test circuit breaker trip functions (overcurrent, short circuit, undervoltage where fitted)
  • Check insulation resistance of busbars and feeder cables
  • Verify protection relay settings against the vessel's approved discrimination/selectivity study
  • Inspect enclosure seals/gaskets and IP rating integrity, especially in a wet space
  • Check busbar and cable connection tightness/torque per the maker's schedule
  • Confirm emergency lighting and alarm circuits fed from the board function correctly
  • Verify labelling and the single-line diagram at the board match the as-built condition

Service intervals

Thermographic surveyannually or per the class/PMS requirement
Circuit breaker function/trip testannually, alongside the emergency generator monthly test where practical
Insulation resistance testannually or per class survey requirement
Busbar connection torque checkat overhaul or per the maker's schedule, typically every 2-5 years
Emergency generator auto-start/changeover testweekly no-load and monthly on-load test per SOLAS, full blackout test at survey

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Critical spares

  • Circuit breaker matching the board's frame and rating
  • Protection relay unit
  • Indicator lamps and control switches
  • Fuses matching the board rating
  • Auxiliary/control contactors for the changeover logic

Safety

  • Arc flash hazard when working live or racking breakers - use appropriate PPE and follow lockout/tagout
  • Stored energy in spring-charged breaker mechanisms - discharge before maintenance
  • The emergency switchboard is normally live at all times from the emergency source - never assume it is dead because the main board is isolated
  • Condensation/moisture ingress raises shock risk in humid compartments

Class survey

Emergency switchboards are checked at annual survey for correct labelling, insulation resistance and correct function of the automatic changeover/emergency generator start sequence; class wants records of the blackout test demonstrating emergency power restoration within the required time.

Estimated lifetime: Not meaningfully expressed in running hours; low-voltage switchgear service life is typically in the region of 25-30 years with maintenance, or per the breaker's rated number of mechanical/electrical operations - confirm against the manufacturer's documentation for the installed breaker

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