Eaton PKZM0-16 Motor-Protective Circuit Breaker

Order No.: 046938

Part of Moeller PKZM0 series; 3-pole rotary-knob motor circuit breaker integrating overload & short-circuit protection, Class 10 trip characteristic, with built-in phase-failure protection.

✅ Core Technical Parameters

Poles: 3P

Adjustable current setting range: 10～16 A

Rated operational voltage Ue: Max. AC 690 V

Matched motor power (AC-3, 50 Hz):

230 V: 4 kW

400 V: 7.5 kW

440 V: 9 kW

Instantaneous short-circuit trip current: Fixed at 248 A

Trip class: Class 10

Termination: Screw terminals

Protection class: IP20 (front touch-safe)

Overall dimensions: W45 mm × H93 mm × D76 mm

Electrical endurance: 100,000 operations

Standards: IEC/EN 60947-4-1, VDE, UL508, CE, CSA certified

✅ Key Features

1. Sensitive phase-failure protection; trips rapidly on single phasing to prevent motor burnout.
2. Rotary knob with padlock provision for lockout/tagout (LOTO) safety isolation.
3. Built-in TEST pushbutton for manual mechanical trip testing.
4. Wide range of add-on accessories: auxiliary contacts, fault trip contacts, undervoltage release, shunt trip, side busbars.
5. DIN rail mounting; modular design, directly combinable with DILM contactors to form MSC motor starter units.

✅ Variants with Suffixes (Same Current Rating)

PKZM0-16: Standard screw terminals (Order No. 046938)

PKZM0-16-EA: EA export version

PKZM0-16-SPI32: Screw terminals on line side, push-in spring terminals on load side

PKZM0-16-GVP2: Bulk packaging version

✅ Selection & Equivalent Cross Reference

Domestic equivalents: Delixi CDP6-16, Chint NS2-25 (10–16 A)

Next higher rating in series: PKZM0-20 (16～20 A)

Note: PKZM0 is an integrated breaker; it cannot be used solely as an overload relay. Use ZB series if only thermal overload protection is required.

✅ Troubleshooting Guide

1. Trips immediately with no load: Check if current setting is too low, phase loss, or mechanical trip mechanism jamming.
2. Instant trip on motor startup: Short-circuit protection triggered; inspect motor winding short-circuit or cable fault.
3. Slow trip under sustained overload: Normal Class 10 inverse-time behaviour; if tripping frequently under heavy load, increase the current setting or upgrade to a higher-rated model.

Full Accessory List for PKZM0 Series (Applicable to PKZM0-16)

Installation rule: NHI-E = front-mounted; NHI = side-mounted; AGM = fault trip contact; U-PKZ0 = undervoltage release; A-PKZ0 = shunt trip. Suffix -PI = push-in spring terminals; no suffix = screw terminals.

1. Standard Auxiliary Contacts (Main contact status feedback: closed/open signal)
2. NHI-E-10-PKZ0｜1NO, front-mounted
3. NHI-E-01-PKZ0｜1NC, front-mounted
4. NHI-E-11-PKZ0｜1NO+1NC (most common), front-mounted
5. NHI11-PKZ0｜1NO+1NC, side-mounted
6. NHI21-PKZ0｜2NO+1NC, side-mounted
7. NHI12-PKZ0｜1NO+2NC, side-mounted

PI version available: NHI-E-11-PKZ0-PI (spring terminals)

Rating: AC-15 230 V 0.5 A, DC-13 24 V; used for PLC feedback and status indication lamps.

2. Fault Trip Contacts (Only actuated on protective trip – critical distinction!) AGM Series

Only changes state when tripped by overload / short-circuit / phase loss; remains inactive during manual ON/OFF operations, used exclusively for fault alarm signals.

1. AGM2-01-PKZ0｜2NC (standard for engineering projects)

PKZM0 Full Model List

1) Standard Screw Terminal Models (Base Version, No Suffix)

Suffix Definition (Same current rating, only terminal/function differs)

1. -PI: Push-in spring terminals (tool-free wiring); example: PKZM0-16-PI
2. -C: Older spring clamp version (same function as PI)
3. -EA: Export overseas standard model (identical construction to domestic standard version)
4. -T: Transformer protection variant (NO phase-failure protection, only thermal + short-circuit trip); example: PKZM0-0,63-T
5. /AK: Thumb-lock rotary handle, field padlockable
6. -SPI32: Mixed terminals: line-side screw, load-side push-in

2) PKZM01 Compact Series (Toggle handle, NO phase-failure protection; only overload + short-circuit trip)

Note: PKZM01 has no phase-loss protection; only for small motors without single-phasing risk.

3) Higher-Current PKZM4 Series (16～63 A, fully interchangeable accessories with PKZM0)

PKZM4-16 / PKZM4-20 / PKZM4-25 / PKZM4-32 / PKZM4-40 / PKZM4-50 / PKZM4-63

4) Model Naming Rule (Quick Selection)

PKZM0 16 PI

1. PKZM0 = Motor-protective circuit breaker (with phase-failure protection, rotary handle)
2. Numeric value = Maximum adjustable current (16 = 10~16 A)
3. Suffix = Terminal type / special function

5) Standard Accessory List (Fits all PKZM0 variants)

1) Auxiliary Contacts (Position feedback)

NHI-E-11-PKZ0 (Front-mounted: 1NO+1NC)

NHI11-PKZ0 (Side-mounted: 1NO+1NC)

2) Fault Trip Contacts (Only triggered by overload/phase loss/short-circuit)

AGM2-01-PKZ0 (2NC, standard for site engineering)

3) Voltage Releases (Only one can be fitted at a time, not both together)

U-PKZ0 Undervoltage release (24VDC / 110V / 230V / 400V)

A-PKZ0 Shunt trip release (24VDC / 110V / 230V / 400V)

4) Mechanical Accessories

PKZ0-XRH: Extended rotary handle for cabinet door mounting (padlockable)

CL-PKZ0: Phase barrier

B-PKZ0: Parallel busbar for multiple units

6) Selection Guidelines

1. Require phase-failure protection → Choose PKZM0; No phase-loss risk & cost-sensitive → Choose PKZM01.
2. Remote tripping → Select A-PKZ0 shunt trip; Anti-restart on power failure → Select U-PKZ0 undervoltage release (cannot mount both).
3. Frequent on-site wiring → Prefer -PI push-in terminal version; General installation → Standard screw terminal model.