EOCR-PMZ (panel embedded) and EOCR-PFZ (embedded) motor comprehensive protector

Product positioning and types

EOCR-PMZ: perforated (Window/Hole Type), panel installation

EOCR-PFZ: Terminal Type, Panel/Rail Installation

Purpose: Comprehensive protection for three-phase motors/lines, current monitoring, and 4-20mA transmission output

Core Features (Key Highlights)

Automatic loop display

Every 5 seconds, it automatically displays in rotation: L1 → L2 → L3 three-phase current → leakage current, and can be manually locked with one click.

Integrated with full function protection

Overcurrent, undercurrent, locked rotor, locked rotor start, phase imbalance, phase failure, reverse phase, ground fault (leakage).

Wide range measurement

Body: 0.1~60A; in combination with external CT: 1~3600A.

Fault memory

Automatically save the reasons for the last 3 trips and the current at the time of the trip, without loss during power outages.

Run time management

Total running time timer (maximum 99999 hours), maintenance reminder can be set (such as bearing replacement).

4~20mA analog transmission output

For remote current monitoring, shielded cables must be used.

Optional overcurrent characteristics

Definite, Inverse, Thermal Inverse.

Ground fault (leakage) detection

Adopting zero phase current ZCT detection, supporting timed/inverse time limit.

Hot memory protection

Automatically reset the heat accumulation value 20 minutes after the motor stops.

**Fail Safe fault safety function**

Power self-test, output contact forced action in case of abnormality, switchable.

Complete protection function list

Overcurrent protection (OC)

Under current protection

Stall During Startup

Jam During Operation protection

Phase Loss Protection

Unbalance protection

Reverse phase protection

Earth Fault Protection

Secondary Functions

4~20mA current transmission output

Accumulated total running time (cannot be changed)

Preset running time reminder (can be set from 1 to 9900h)

Three reset methods

Manual reset (H-r)

Electric reset (E-r, power-off reset)

Automatic reset (A-r, 0.3s~20min)

✘ Automatic reset is not allowed for phase failure, reverse phase, grounding, and locked rotor.

Fault record query (last 3 times)

Fail Safe self diagnostic security output

Technical specifications (key parameters)

Current setting range: 0.1~3600A (body+external CT)

Main body hole type range

1 hole: 0.5~60A

2-hole: 0.25~5A

5 holes: 0.1~2A

Grounding fault current: 0.03~10A

working power supply

AC/DC 24V

AC 85~250V 50/60Hz

Output contact: AC250V 3A (resistive)

Accuracy: ＜ 1A ± 0.05A; ≥ 1A ± 5%

Insulation: DC500V 10M Ω or above

Installation: 35mm DIN rail/panel opening

EMC: Meets IEC61000-4-2 static electricity, surge, etc

Operation and Display

Display section

5-digit 7-segment LED: displays current/time/parameters

Phase sequence indicator light: L1/L2/L3

Bar chart: Load rate (65-100%)

button

UP/DOWN: Parameter selection/numerical adjustment

SET/STORE: Set/Save

RESET: Reset

Set process

Mode → Set → Adjust → Store → Reset

Display mode switching

Auto cycle ← → Manual single display (press SET to switch)

Protective action characteristics

Overcurrent characteristic

Fixed time limit (dE): current exceeds the standard → fixed time trip

Inverse time limit (In): The larger the current, the faster the trip

Thermal memory inverse time limit (th): Memory motor heating status, reset after 20 minutes of shutdown

Ground fault characteristics

Time limit/inverse time limit optional

Action Time

Adjustable from 0.1 to several hundred seconds

Trip Reason Display Comparison Table

OC: Overcurrent

Under: Undercurrent

Stall: Start blockage

Jam: Running blockage

Rev: Reverse phase

Unb: Imbalance

Loss: phase failure

EF: Grounding fault

After tripping, it can be directly viewed, and the current of each phase during tripping can also be checked.

Key points of wiring (important)

ZCT zero phase transformers must not be grounded.

4~20mA output must use shielded cables.

When used for frequency converters, it is recommended to install it on the secondary side of the frequency converter.

When starting the star delta, ZCT is installed above the main contactor and below the main circuit breaker.

When Fail Safe (FS) is enabled:

Power on → disconnect 95-96, close 97-98

Normal operation → 57-58 closed

Model and selection rules

1. Current range code

WR: Wide range 0.5~60A

H1：100:5 CT

HH：150:5 CT

H2：200:5 CT

H3：300:5 CT

H4：400:5 CT

2. Output contacts

D: Standard b-a output (95-96/97-98)

3. Working power supply

B：AC/DC 24V

Z7：AC 85~250V

4. Structural form

W: Window Perforation (PMZ)

T: Terminal Type (PFZ)

5. Accessories

ZCT-035/080/120 (aperture)

15PIN connecting cable (0.5~10m)

Applicable scenarios

Three phase asynchronous motor protection

Fan, water pump, compressor, conveyor belt

Low voltage distribution circuit current monitoring

A system that requires remote 4-20mA monitoring

Equipment that requires maintenance of timing and fault recording