Description

ABB ZM-32-PKZ2+HI11S-PKZ2

ZM‑32‑PKZ2 is a 32A thermal-magnetic trip module for PKZ2 series motor protection circuit breakers; HI11S‑PKZ2 is the matching auxiliary contact module with one normally open and one normally closed contact. The combined assembly provides overload, short-circuit and phase-loss protection as well as status signal output for three-phase motors, widely applied in motor feeder circuits of control cabinets and MCC systems.

I. ZM‑32‑PKZ2 (Thermal-Magnetic Trip Module)

1. Basic Information

Model: ZM‑32‑PKZ2

Brand: ABB (formerly Moeller)

Compatible base unit: PKZ2 series motor protection circuit breakers (e.g. PKZ2‑32)

Rated current range: 24～32A (adjustable via front dial)

Protection functions: Thermal overload protection + magnetic short-circuit protection + sensitive phase-failure protection

Mounting: Tool-free snap-on installation onto PKZ2 base frame

Weight: Approx. 200g

2. Technical Specifications

Overload protection (thermal trip): Bimetallic element, Class 10 inverse time characteristic; adjustable setting Ir = 24～32A

Short-circuit protection (magnetic trip): Electromagnetic instantaneous trip; pickup range: 8.5～14×Ir (approx. 275～425A)

Phase-loss protection: Three-phase sensitive design for accelerated tripping upon single-phase loss

Rated insulation voltage Ui: 690V AC

Rated impulse withstand voltage Uimp: 6000V

Short-circuit breaking capacity: 42kA @600V AC; 65kA @480V AC

Operating temperature: -20℃～+60℃

Protection class: IP20 (indoor cabinet mounting)

3. Structure & Operating Principle

Modular independent trip unit consisting of thermal elements, magnetic trip coil, mechanical latch and trip indication window.

Overload condition: Current exceeds Ir → bimetallic strip deforms thermally → breaker trips
Short-circuit / locked rotor condition: Heavy fault current energizes magnetic coil → instantaneous latch release & tripping (millisecond level)
Phase loss condition: Unbalanced three-phase current creates uneven temperature across thermal elements → accelerated trip action
Front-mounted trip indicator window enables direct visual fault identification.

II. HI11S‑PKZ2 (Auxiliary Contact Module)

1. Basic Information

Model: HI11S‑PKZ2

Configuration: 1NO + 1NC auxiliary contacts (1 normally open + 1 normally closed)

Compatibility: PKZ2 base breaker + ZM trip block

Application: Equipment status indication, fault alarming, interlock control and PLC signal feedback

Mounting: Tool-free snap-fit installation on the right side of ZM trip module

2. Contact Ratings

Contact arrangement: 1NO + 1NC

Rated operational current (AC‑15): 3A @230V; 1A @400V

Mechanical endurance: ≥100,000 operating cycles

Electrical endurance: ≥10,000 operating cycles under rated load

Protection rating: IP20

ZM-32-PKZ2+HI11S-PKZ2.png

III. Overall Features of Combination Set

Three-in-one protection plus signal output: Overload/short-circuit/phase-loss protection together with 1NO/1NC status feedback
High breaking capacity: Up to 65kA at 480V, eliminating requirement for upstream backup fuses
Convenient field maintenance: Pluggable modular design for direct replacement without disconnecting main power circuit
Wide current coverage: 24～32A rating matches 11～15kW three-phase motors at 400V system
Robust industrial construction: Vibration-resistant, wide-temperature tolerant and high-insulation design for pumps, fans and conveyors

IV. Typical Applications

Standalone protection & control for 11～15kW /400V three-phase asynchronous motors
Motor feeder circuits inside control cabinets and MCC panels
Drop-in replacement for conventional “circuit breaker + thermal overload relay” assemblies for simplified layout
Sites requiring remote alarm, interlock logic and PLC digital feedback

V. Selection & Installation Guidelines

Must be assembled with PKZ2‑32 base breaker; cannot work independently
Current setting: Dial set to 1.0～1.15 × motor rated current
Mounting sequence: Install ZM‑32‑PKZ2 first, then snap HI11S‑PKZ2 into position until audible locking click is heard
Main circuit wiring: AWG14～AWG6 copper conductors, tightening torque:1.8N·m; only 75℃ rated copper cable permitted
Auxiliary wiring: NO/NC terminals connect to indicator lamps, buzzers or PLC digital input modules

VI. Cross Reference of Common Series Models

ZM‑0.6‑PKZ2: 0.4～0.6A

ZM‑1.6‑PKZ2: 1～1.6A

ZM‑10‑PKZ2: 2.5～10A

ZM‑25‑PKZ2: 6～25A

ZM‑32‑PKZ2: 24～32A (this item)

ZM‑40‑PKZ2: 0.6～40A