benlong 
MCCB Laboratory Integrated Testing bench
An integrated test bench capable of performing magnetic trip testing, thermal calibration, and long-duration thermal calibration.
MCCB Laboratory Integrated Testing Bench for Magnetic Trip, Thermal & Long-Term Calibration
The MCCB laboratory integrated testing bench combines three MCCB protection tests in a single unit: the magnetic trip test (instantaneous), thermal calibration (time-delay), and long-term calibration (long-time-delay). One test function is active at a time, and the bench covers a wide output range — AC300–10000A for instantaneous testing, AC100–2000A for time-delay, and AC100–1000A for long-time-delay — so a single bench serves your full molded case circuit breaker range instead of three separate test stations.
The bench ships with two pneumatic fixture sets (250A-type and 400/630A-type) for instantaneous and time-delay testing, plus a complete long-term test lead package. Power source accuracy is ±3% for instantaneous and ±1.5% for time-delay testing. Core components come from established brands — Chint contactors, Xingchen cylinders, a Tonghui transformer, and a Shunhang instantaneous power supply — for dependable day-to-day laboratory operation.
3 test functions in one bench | 250A & 400/630A fixtures included | Accuracy ±1.5% (delay) / ±3% (instantaneous)
What is an MCCB Laboratory Integrated Testing Bench?
An MCCB laboratory integrated testing bench is a consolidated test station that verifies the protection characteristics of molded case circuit breakers across three test types that would traditionally require three separate benches. The magnetic trip test applies a high instantaneous current (AC300–10000A) to verify the breaker’s short-circuit tripping behavior; thermal calibration applies a time-delay current (AC100–2000A) to verify the bimetal-based overload characteristic; and long-term calibration applies a sustained lower current (AC100–1000A) for extended-duration verification. The bench operates one function at a time, selected by the operator. For instantaneous and time-delay tests, the breaker is held and contacted by pneumatic fixtures — a 250A-type and a 400/630A-type fixture set are both included as standard. For standard long-term tests, the bench outputs through two 500 mm² copper bars, and the operator connects the supplied test leads manually. This one-bench architecture is designed for MCCB manufacturers’ laboratories, quality departments, and R&D teams that need calibration-grade accuracy without dedicating floor space and budget to three separate test stations.
Magnetic trip, thermal calibration, and long-term calibration in one bench (one function at a time).
Instantaneous AC300–10000A · time-delay AC100–2000A · long-time-delay AC100–1000A.
Power source accuracy of ±3% (instantaneous) and ±1.5% (time-delay).
250A-type and 400/630A-type pneumatic fixtures ship with the bench as standard.
Testing Process & Key Stations
Technical Specifications
| Applicable products | MCCB — 250A-type and 400/630A-type fixtures included |
|---|---|
| Test functions | Magnetic trip test (instantaneous) / Thermal calibration (time-delay) / Long-term calibration — one function active at a time |
| Output current range | Instantaneous: AC300–10000A | Time-delay: AC100–2000A | Long-time-delay: AC100–1000A |
| Power source accuracy | ±3% (instantaneous) | ±1.5% (time-delay) |
| Test connection | Pneumatic fixture contact for instantaneous & time-delay tests; standard test output via 2 × 500 mm² copper bars with manual lead connection |
| Long-term test leads (included) | 120 mm² × 4, 240 mm² × 4, 185 mm² × 8 — each 2 m long; additional leads available on request (please specify the exact product model) |
| Key components | Chint contactors · SMC cylinders · Tonghui transformer · Chroma power supply |
| Power supply | 380V, 120kW |
| Machine dimensions | L1800 × W1500 × H1900 mm |
Detailed Process Flow
A typical test cycle on the integrated bench runs as follows:
- Select the test function – Choose instantaneous, time-delay, or long-time-delay mode (only one function can be used at a time).
- Mount the MCCB – Place the breaker in the matching fixture: 250A-type or 400/630A-type.
- Make the connection – The pneumatic fixtures contact the breaker automatically for instantaneous and time-delay tests; for standard long-term tests, the operator connects the supplied test leads to the 2 × 500 mm² copper bar outputs.
- Run the test – The bench applies the set current within the calibrated range and the trip behavior of the breaker is verified.
- Unload and continue – Remove the tested breaker and proceed with the next unit or switch to another test function.
Core Technical Advantages (Laboratory-Grade Design)
Three benches consolidated into one
Magnetic trip, thermal calibration, and long-term calibration share one cabinet, one power connection, and one operator position — saving laboratory floor space and equipment investment compared with three separate test stations.
Full-range MCCB coverage
With instantaneous output up to AC10000A and dual fixture sets for 250A and 400/630A frames, one bench covers the trip verification needs of a complete MCCB product lineup.
Calibration-grade source accuracy
±1.5% accuracy on time-delay testing and ±3% on instantaneous testing give repeatable, trustworthy calibration results for laboratory and quality-control use.
Proven branded core components
Chint contactors, Xingchen cylinders, a Tonghui transformer, and a Shunhang instantaneous power supply are used throughout — established brands that simplify maintenance and spare parts supply.
Applications and Integration
Custom Engineering & Delivery
Request an MCCB Testing Bench Quote
Tell us your MCCB frame sizes, test standards, and current ranges. Our engineers will configure the integrated testing bench with the right fixtures and test lead package for your laboratory.
WhatsApp: +86 150 5837 0007 | Email: xsb@benlongkj.cn | English & Chinese support
Why Choose Benlong for MCCB Test Equipment?
- 15+ years of assembly and testing equipment for low‑voltage electrical products
- Three-in-one integration: magnetic trip test, thermal calibration, and long-term calibration in a single bench
- Wide output range up to AC10000A instantaneous with calibration-grade accuracy
- Dual pneumatic fixture sets and complete test lead package included as standard
- Global service and spare parts support
Standard Delivery Includes
MCCB integrated testing bench consisting of: · Instantaneous / time-delay / long-time-delay test circuits; Shunhang instantaneous power supply; Tonghui transformer; Chint contactors; Xingchen pneumatic cylinders; 250A-type fixture set; 400/630A-type fixture set; Long-term test lead package (120 mm² × 4, 240 mm² × 4, 185 mm² × 8, 2 m each); 2 × 500 mm² copper bar outputs; Installation commissioning; One-year warranty
Frequently Asked Questions
Three MCCB protection tests: the magnetic trip test (instantaneous), thermal calibration (time-delay), and long-term calibration (long-time-delay). The bench runs one test function at a time, selected by the operator before the cycle starts.
AC300–10000A for instantaneous testing, AC100–2000A for time-delay testing, and AC100–1000A for long-time-delay testing, with power source accuracy of ±3% (instantaneous) and ±1.5% (time-delay).
The bench ships with two pneumatic fixture sets as standard: a 250A-type fixture and a 400/630A-type fixture. If your product range includes other frame sizes, contact us with your specific models for a tailored fixture proposal.
For instantaneous and time-delay tests, the pneumatic fixtures make contact with the breaker automatically. For standard long-term tests, the bench outputs through two 500 mm² copper bars and the operator connects the supplied test leads manually.
Yes — a complete long-term test lead package is included: four 120 mm² leads, four 240 mm² leads, and eight 185 mm² leads, each 2 m long. Additional or custom leads can be supplied on request; please specify the exact product model when ordering.
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