IEC60898-1 Circuit Breakers 28-day Tripping Characteristics Tester

Standards & Clauses:

The design and manufacturing of this test equipment follow the provisions outlined in IEC 60898-1 (9.1, 9.8, 9.9, 9.10), IEC 60947-1 (7.2.1), along with other related standards.

Product Information:

The equipment is designed to verify the compliance of circuit breakers with standard requirements by applying 1.13, 1.45, and 2.55 times the rated current to check whether tripping occurs within the specified time limits. It is also capable of testing the instantaneous tripping characteristics by applying currents ranging from 3 to 20 times the rated value to observe the response time. Additionally, it meets the 28-day continuous testing requirements specified by the standard.

It is suitable for online testing of molded case circuit breakers and miniature circuit breakers before leaving the factory. It is a necessary equipment for electrical performance testing of circuit breaker manufacturers.

Technical Parameters:

Project specifications	Parameter content
Applied standard	IEC 60898-1
Clause	9.1, 9.8, 9.9, 9.10
Control method	18.5-inch touch-screen computer operation
Program language	Russian (provided by client translation)
Test items	1. Delay test of miniature circuit breaker 2. Instantaneous test of miniature circuit breaker 3. Temperature rise test of miniature circuit breaker 4. 28-day test of miniature circuit breaker
Test station	3 separate isolated chambers Chamber 1 is: 1 delayed tripping station 1.13+1.45In; 2.55In 1 instantaneous tripping station 3-20In 1 station testing "28 days" 1 station testing temperature rise Chambers 2 and 3. Each chamber includes: 1 delayed tripping station 1.13+1.45In; 2.55In 1 station testing "28 days" 1 station testing temperature rise
Input power	AC380V 50Hz 40kVA

Delay Trip Test:

Output AC current	0.35~200A
Output AC voltage	1-5V
Output current channel	3-channel, multi-P circuit breaker contacts are connected in series to test several switches at the same time (max. 3 pcs.)
Test miniature circuit breaker products	0.5~63A
Current output waveform	Sine wave (correction equipment current waveform distortion is not more than 5%, system error is not more than 3%)
Current control method	Automatic adjustment, the current is set on the touch screen
Current accuracy	Level 0.5
Voltage accuracy	Level 0.5
Transformer ratio	200/5A
Test time	1~999999s
Current	After 1.13 times of current is applied, it quickly and automatically rises to 1.45 times of current in 5 seconds
Fixture	Adopt the terminal method, delayed: one station, instantaneous: one station.

Instantaneous Trip Test:

Fixture	Adopt the terminal method, delayed: three stations, instantaneous: one station.
Output current	AC3A～1500A
Instantaneous tripping currents	3-20 In
Output voltage	1-5V
Output current channels	1 channel
Current accuracy	0.5 level
Resolution	≥0.1A
Instantaneous test time	≤0.2s
Action time upper limit setting	1~200ms
Action time lower limit setting	1~200ms
Test station	1 station
Timing time	1~9999ms
Protective function:	Short circuit protection, overload protection, leakage protection
Temperature rise test	Under normal working conditions, when the circuit breaker is tested according to the specified conditions. The circuit breaker should not be damaged to affect its function or safety of use.
Temperature measurement channel	32channels, temperature resolution: 0.1 degrees, 10 channels per chambers (two channels measure the ambient temperature inside the chamber), 2 spare temperature channels
Thermocouple	T type or K type
Current	0.5~63A
Voltage	AC 30V
Testing time	0-9999 hours
Temperature curve	Computer display with temperature data logging table
Temperature measurement range	0~200 degrees

28-day Test:

Test program	The sample is supplied with AC 30V and rated current, the power-on time is 21 hours, the power-off time is 3 hours, and the cycle is 28 times. The terminal temperature is measured during the last power-on cycle, and compared with the initial measured temperature, the temperature rise value is compared with the standard requirements. After the temperature rise measurement, the current rises to the tripping current value in 5 seconds, and the circuit breaker should trip within the given/preset time.
Output voltage	Not less than AC30V, adjustable
Output AC current	AC 0.5-125A
Power on time	Power-on time 0-99h, can be preset
Power off time	0-99h can be preset
Number of cycles	0-9999 times can be preset
Tripping time	recordable
Tripping current	1.0~200A
Evaluation of results	1. Whether the circuit breaker tripped during the test or not. If it tripped, it failed; if it did not trip, it passed. 2. Temperature rise comparison, if it exceeds the standard value by 15K, it is defective; if it does not exceed the standard value, it is acceptable. 3. After the current rises to the tripping current, if it trips within the given/preset time, it is acceptable; if it exceeds the given/preset time or does not trip, it is defective.

Equipment Characteristics:

The chamber body is fabricated from premium steel with welded construction, coated and sealed to provide anti-static, anti-corrosion, and rust-resistant protection. Its upper section integrates a user-friendly control panel, a main power switch, and multiple terminal connections dedicated to delayed tripping tests. With a rational design, the equipment ensures ease of use, stable performance, and an aesthetically pleasing appearance.

For delayed tripping tests in accordance with IEC 60898-1 clauses 9.10.2.1 or 9.10.2.2, all three chambers of the SN2501-3C can be operated independently and simultaneously. Instantaneous tripping tests, as defined in IEC 60898-1 clauses 9.10.3.2 to 9.10.3.4, are conducted exclusively in Chamber 1.

Test type	Chamber 1	Chamber 2	Chamber 3
Delay tripping test	√	√	√
Instantaneous tripping test	√

Chamber 1, Chamber 2, and Chamber 3 are independent and can be freely combined for testing.

Note: The delay and instant of box 1 cannot be tested at the same time.

Chamber 1 instantaneous trip test and 28-day test cannot be performed at the same time.

Temperature rise and 28-day test procedure compatibility

Test type	Chamber 1	Chamber 2	Chamber 3
Temperature rise	√	√	√
28-day test procedure	√	√	√

The equipment is designed with flexibility and efficiency in mind. It fully supports simultaneous or independent execution of both the temperature rise test and the 28-day endurance test, either within the same chamber or across different chambers—meeting a wide variety of testing needs.

Each chamber operates independently, allowing for different test types to run simultaneously without interference. Equipped with a dedicated heating system, each chamber provides a precise temperature control range of RT+5°C to 50°C, ensuring that all test samples operate under stable, controlled ambient conditions. To further enhance accuracy, a three-point ambient temperature monitoring system is integrated into the design.

The intelligent software system offers maximum operational flexibility—any test program can be stopped at any stage, with all results automatically saved for later analysis. This greatly improves testing efficiency and provides full control to meet dynamic laboratory requirements.

Highlights at a Glance:
✔ Simultaneous or independent multi-chamber testing
✔ Independent heating with precise temperature control
✔ Three-point ambient temperature monitoring
✔ Flexible software with real-time result saving
✔ Designed for reliability, efficiency, and user convenience

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