ABB CS3107KT92
ABB CS3107KT92 - Image 2

ABB CS3107KT92

Product Brief:​ The CS3107KT92 is a pre-assembled / catalogued motor starter combination consisting of an ABB S200 series miniature circuit breaker (MCB) for short-circuit protection, a 3-pole contactor (typically A… series, e.g., AX or AF frame), and a matching thermal overload relay (07KT92 or equivalent) providing overload and phase-failure protection for a 3-phase AC induction motor. Exact current ratings vary — typical contactor rating 9–12 A (AC-3), overload adjustable 7–10 A range.

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Category: SKU: ABB CS3107KT92

Description

ABB CS3107KT92

  • Technical Specifications (typical for this kit class):
    • MCB: 3-pole, C-curve or D-curve, 10–16 A rated (short-circuit breaking capacity 6 kA or 10 kA per IEC 60898/ 60947-2)
    • Contactor: 3-pole, AC-3 rating 9 A / 12 A @ 400 V AC; coil voltage per order (24 V DC, 110 V AC, 230 V AC common)
    • Thermal Overload Relay: Adjustable current setting (e.g., 7–10 A or 5.5–8 A range), Class 10 trip characteristic, single-phase sensitivity (phase-loss protection)
    • Auxiliary Contacts: Overload relay typically provides 1 NO + 1 NC for alarm/trip signaling
    • Mounting: 35 mm DIN rail (EN 60715)
    • Standards: IEC 60947-4-1, IEC 60898-1, UL 508, CSA
  • Functional Features:
    • Integrated short-circuit + overload + phase-loss protection in one DIN-rail footprint
    • Tool-less or minimal wiring between MCB→Contactor→OLR (often bus-linked in combi-kit)
    • Manual ON/OFF via contactor test button; overload trip resets after cooling
    • Clear trip class indication (Class 10 standard for motor starting)
  • Application Scenarios:
    • 3-phase motor control for pumps, fans, compressors up to ≈5.5 kW (400 V)
    • Conveyor drive starters in material handling
    • HVAC chiller/condenser fan motor starters
    • Small process mixer / agitator local control
  • Material & Structure:
    • MCB: Thermoplastic housing, silver alloy contacts
    • Contactor: Silver-cadmium oxide (AgCdO) or AgSnO₂ contacts, AC/DC magnet coil, molded polyester bobbin
    • Overload Relay: Bimetallic strip elements with heater coils matched to contactor frame
    • All DIN-rail snap-mount; often supplied with bridging bars pre-installed
  • Working Principle:

    The MCB protects against short circuits by tripping a thermal-magnetic mechanism when current exceeds its magnetic trip threshold. Under normal running overload (e.g., stalled rotor, over-mechanical load), the bimetallic elements in the thermal overload relay heat and deflect, opening the NC contact which interrupts the contactor coil circuit — dropping out the contactor and disconnecting motor power. Phase-loss (one phase open) causes unbalanced heating and also trips the OLR.

  • Installation Requirements:
    • Mount on 35 mm DIN rail in motor control center or local enclosure
    • Verify coil control voltage matches available control supply (24 V DC / 110 V AC / 230 V AC)
    • Set thermal overload dial to motor FLA (full load amps) per motor nameplate
    • Provide properly sized motor power cables; ensure earthing per local code
    • Wire stop/start pushbuttons to contactor A1/A2 via OLR NC contact
  • Precautions:
    • Do NOT set OLR dial above motor FLA — defeats overload protection
    • Verify MCB rating is appropriate — too high = no short-circuit protection for small motors; too low = nuisance trip on inrush
    • After a thermal overload trip, allow OLR to cool (several minutes) before resetting
    • For frequent start/stop duty (>X times/hour), verify contactor AC-4 rating is adequate — otherwise upsize

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