4P Electronic Trip Unit

Here at Pugao(Plannter Electric), our core belief is that electrical safety shouldn't be a luxury—it's the bedrock of a secure and comfortable life. Consider our 100A, 4P Electronic Trip Unit: we use high-quality thermosetting plastic for the casing, which is injection-molded under high heat and pressure. This advanced manufacturing process provides outstanding dimensional stability, enhanced insulation strength, and consistent arc resistance, giving you confidence in your electrical infrastructure. Have questions? Feel free to reach out! We're excited to talk and collaborate on ensuring your electrical safety.

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Product Description

The 4P Electronic Trip Unit is an advanced protection module used in molded case circuit breakers (MCCBs), designed to monitor and control all four conductors in a three-phase four-wire system (L1, L2, L3, and Neutral). Unlike traditional three-pole systems, it ensures full isolation and protection, making it a critical solution for modern electrical distribution where safety and power quality are essential.

Controls and protects phase and neutral conductors simultaneously
Provides intelligent and precise fault detection
Enhances system safety in complex electrical environments

4P Electronic Trip Unit

Product specification

Type	Rated Current (A)	Pole number	Rated Insulating Voltage(V)	Rated operating voltage(V)	Ultimate short circuit breaking capacity(KA)	Servies short circuit breaking capacity(KA)	Utilization category
PLM1-63L	(6),10,16,20,25 ,32,40,50,63	3	AC 500V	400V	25	18	A
PLM1-63M	(6),10,16,20,25 ,32,40,50,63		AC 500V		50	35
PLM1-100L	(10),16,20,25,32,40, 50,63,80,100		AC 690V		35	22
PLM1-100M					50	35
PLM1-100H					85	50
PLM1-225L	100,125,160,180,200,000	4			35	25
PLM1-225M					50	35
PLM1-225H					85	50
PLM1-400L	225,250,315,400				50	35
PLM1-400M	225,250,315,400				65	42
PLM1-630L	400,500,630				50	35
PLM1-630M					65	42
PLM1-630H					100	65
PLM1-800M	630,700,800	3			70	50
PLM1-800H	630,700,800				100	65
PLM1-1250	80,010,001,250				65	32.5
PLM1-1250	80,010,001,250				65	32.5

Key Features and Benefits

Neutral Protection

Provides direct monitoring and protection of the neutral conductor
Prevents neutral overload caused by harmonic currents from non-linear loads
Ensures all poles, including neutral, are disconnected during faults
Addresses safety gaps found in traditional three-pole breakers

Adjustable Protection

Equipped with electronic trip settings for precise protection control
The overload, short-circuit, and instantaneous protection parameters of the 4P Electronic Trip Units are fully adjustable
Improves selectivity and coordination within the distribution system
Reduces unnecessary tripping and enhances system uptime

Advanced Functionalities

Ensures full circuit isolation, preventing backfeeding risks
Enhances safety during maintenance and servicing operations
Maintains neutral integrity in power transfer scenarios
Supports safe switching between mains and generator power

Metering and Communication

Supports real-time monitoring of current across all four poles
Optional communication interfaces for system integration
Enables data-based diagnostics and predictive maintenance
Improves visibility and control of electrical infrastructure

Applications

Main circuit breaker in building and industrial distribution panels
Automatic Transfer Switch (ATS) systems utilizing 4P Electronic Trip Units for safe power switching.
Three-phase four-wire systems requiring full isolation
Commercial and industrial facilities with sensitive or non-linear loads
Critical environments where continuous power and safety are essential

FAQ

What is 4P4D vs. 4P3D?

4P4D (Four Pole Four Detection): All four conductors (L1, L2, L3, N) are fully monitored and protected
4P3D (Four Pole Three Detection): Only the three phase conductors are monitored, while the neutral is switched but not actively protected
4P4D provides higher safety by including neutral current detection and protection
The 4P Electronic Trip Unit with 4P4D is recommended for systems with harmonic loads or sensitive equipment

Can the Neutral Protection Be Adjusted?

Yes, neutral protection settings are typically adjustable in advanced trip units
Users can configure neutral current protection levels (e.g., 50%, 100%, or disabled)
Adjustment helps match system requirements and load characteristics
Improves flexibility in applications with varying neutral current conditions

What Is the Purpose of Neutral Protection?

Prevents overheating and damage caused by excessive neutral current
Addresses harmonic distortion from non-linear loads (e.g., UPS, LED lighting, IT equipment)
Ensures safe operation in three-phase four-wire systems
The 4P Electronic Trip Unit ensures full protection by monitoring both phase and neutral conductors

How Do You Test the Trip Unit?

Use the built-in test button (if available) for functional checks
Apply secondary current injection testing for precise calibration verification
Confirm trip response under simulated overload or fault conditions
Regular testing ensures reliability and compliance with maintenance standards

What Does It Mean If a Status Lamp Is On?

Power Indicator: Trip unit is energized and operating normally
Alarm Indicator: Warning condition such as overload or pre-trip signal
Trip Indicator: Breaker has tripped due to a fault condition
Fault Code Display (if available): Provides detailed fault diagnostics
Status lamps help operators quickly identify system conditions and take action

Hot Tags: 4P Electronic Trip Unit

Related Category

AC Molded Case Circuit Breaker

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Contact Info

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Address

Qiligang Industrial Zone, Liushi Town, Yueqing City, Zhejiang Province, China
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Tel

+86-18072106366
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E-mail

kevin@pugaoai.com

For inquiries about mini circuit breaker, voltage protector, changeover switch or price list, please leave your email to us and we will be in touch within 24 hours.