WESTINGHOUSE E-Series MCCB (Molded Case Circuit Breaker)

WESTINGHOUSE E-Series MCCB (Molded Case Circuit Breaker)

Product Overview and Brand Background

Brand foundation: As a globally renowned brand with a 130 year history of product innovation, Westinghouse's business covers areas such as home appliances, consumer electronics, power generation and distribution equipment, with reliability and innovation as its core advantages.

Product positioning: The E-series molded case circuit breaker (MCCB) is the core product in its power transmission and distribution field, designed specifically for industrial and civilian power distribution systems. Its core function is to achieve overload protection and short circuit protection of the circuit, ensuring the safety of electrical equipment and lines.

Core standard: The product fully complies with the IEC 60947-2 international standard, has passed CE certification, has stable performance, and has extensive compatibility.

Overview of Core Technical Parameters

Parameter category specific specifications

Rated current range 16-800A (subdivided by frame size: EJ: 100-250A; EK：320-630A）

Rated voltage 240/415V AC (operating voltage); Ui (insulation voltage) up to 1000V; Uimp (impulse withstand voltage) 8-12 kV

Short circuit breaking capacity (Icu/Ics) 25kA, 36kA, 50kA, 85kA (different series correspond to different breaking levels)

Frequency adaptation 50/60Hz

Pole configuration with 3 or 4 poles (both configurations are supported across the entire series)

Calibration temperature 55 ℃ (rated current based on this temperature calibration)

Wiring specifications: Cable cross-section 25-300mm ² (adapted according to different frame sizes)

Certification Mark CE Certification

Product series segmentation and model details

The product is divided into two main frames and multiple sub series based on frame size and short-circuit breaking capacity. Each sub series includes different types of trip and pole combinations, as follows:

（1） EJ framework (rated current 100-250A)

Core features: Compact size, suitable for low and medium current scenarios, with a breaking capacity covering 25-50kA, supporting both automatic and non automatic operation modes.

Subseries and Model Details:

Subseries short circuit breaking capacity, trip type, pole number, rated current specification, reference number example

EIJ 25kA fixed thermal magnetic release (F) 3P/4P 100A, 125A, 160A, 200A, 250A EIJ3100F (W605836), EIJ4100F (W605841)

EIJ 25kA Adjustable Thermomagnetic Release (TM) 3P/4P 100A, 125A, 160A, 200A, 250A EIJ3100TM (W605846), EIJ4100TM (W605851)

ESJ 36kA Adjustable Thermomagnetic Release (TM) 3P/4P 100A, 125A, 160A, 200A, 250A ESJ3100TM (W605856), ESJ4100TM (W605861)

EHJ 50kA Adjustable Thermal Magnetic Release (TM) 3P/4P 100A, 125A, 160A, 200A, 250A EHJ3100TM (W605866), EHJ4100TM (W605871)

EIJY - Non Automatic 3P/4P 100A, 125A, 160A, 200A, 250A EIJY3100 (W605876), EIJY4100 (W605881)

Physical dimensions and weight:

3 poles: height 165mm x width 105mm x depth 77mm, weight 1.5kg

4-pole: height 140mm x width 185mm x depth 77mm, weight 2.0kg

（2） EK frame (rated current 320-630A)

Core features: Suitable for medium and high current scenarios, with a breaking capacity covering 36-50kA, some models support electronic tripping, and higher adjustment accuracy.

Subseries and Model Details:

Subseries short circuit breaking capacity, trip type, pole number, rated current specification, reference number example

ESK 36kA fixed thermal magnetic release (F) 3P/4P 320A, 400A, 500A, 630A ESK3320F (W605886), ESK4500F (W605904)

ESK 36kA Adjustable Thermomagnetic Release (TM) 3P/4P 320A, 400A, 500A, 630A ESK3320TM (W605890), ESK4630TM (W605909)

ESK 36kA Electronic Release (E) 3P/4P 500A, 630A ESK3500E (W607452), ESK4630E (W610439)

EHK 50kA Adjustable Thermal Magnetic Release (TM) 3P/4P 320A, 400A, 500A, 630A EHK3320TM (W605894), EHK4630TM (W605913)

EHK 50kA Electronic Release (E) 3P/4P 500A, 630A EHK3500E (W607454), EHK4630E (W610441)

ESKY - Non Automatic 3P/4P 320A, 400A, 500A, 630A ESKY3320 (W605898), ESKY4630 (W605917)

Physical dimensions and weight:

3 poles: height 257mm x width 140mm x depth 111.7mm, weight 5.7kg

4-pole: height 257mm x width 185mm x depth 111.7mm, weight 7.5kg

Types and characteristics of trip units

The trip unit is the core component of a circuit breaker, responsible for detecting circuit abnormalities and triggering tripping. The E series offers three types to meet different precision requirements:

Fixed Thermal&Magnetic Release

Working principle: The parameters of thermal trip (overload protection) and magnetic trip (short circuit protection) are fixed and do not require manual adjustment, making operation simple.

Applicable scenarios: General scenarios without special adjustment requirements for protection parameters.

Adjustable Thermal&Magnetic Release

Hot release adjustment range: 0.8-1.0In (suitable for different overload current thresholds)

Magnetic release adjustment range: 5-10In (suitable for different short-circuit current thresholds)

Applicable scenarios: Scenarios that require flexible adjustment of protection parameters based on circuit load characteristics, with stronger universality.

Electronic Adjustable Release

Core advantages: Higher adjustment accuracy, more stable protection characteristics, only available in EK frame 500-630A models.

Applicable scenarios: Industrial equipment and precision distribution systems that require high protection accuracy.

Accessories and Installation Configuration

Optional attachments: Supports shunt trip, under voltage trip, auxiliary contacts, trip alarm contacts, and can expand the control and signal feedback functions of the circuit breaker.

Wiring method: Cable wiring is used, supporting both incoming (Line) and outgoing (Load) lines, suitable for cables with cross-sections of 25-300mm ², and meeting different current carrying requirements.

Installation adaptation: The product structure design is suitable for various installation scenarios such as industrial distribution cabinets and civilian distribution boxes, with standardized physical dimensions and strong interchangeability.

Time current characteristics

Circuit breakers of different current levels have clear time current curves to ensure the accuracy of protection actions:

Overload protection (delayed tripping): The closer the current is to the overload threshold, the longer the tripping time (such as the 200-250A model, when overloaded with 1.3 times the rated current, the tripping time is about 10-30 minutes).

Short circuit protection (instantaneous trip): When the short-circuit current reaches the magnetic trip threshold, it will trip instantly (maximum total break time ≤ 0.05 seconds) and quickly cut off the faulty circuit.