SCR Elektroniks Pvt Ltd

MCB Thermal Trip Calibration Test Bench

(IEC 60898 Cl 9.10.1.2, Annex I.1, IS)

The test bench is specially built for low voltage- B, C & D curve MCBs. Specially designed custom built jigs are able to accommodate single, double, three and four pole MCBs. Decades of experience has helped us to design current source (transformer) in a special way such that good current regulation and high accuracy is ensured with a variable range without the use of any variable transformer in the system. The product is better than the competition with conventional technology at a lesser price!

This test equipment also covers testing as per Indian Standard IS 8828 as well as Indonesian Standard SNI 8528-1 (BSN)

The cycle time is around 7 seconds for 4 pole MCB (less than 2 seconds per pole)
Can be used for both production and R&D purpose with report generation and statistical analysis (Gives a glimpse of the test results instantaneously)
Drop down menu in the software to once select the type (rating or calibre) of MCB: Rest of the test parameters get selected automatically (User can simply jump from one type of MCB to other instantaneously)
Current, Type of Curve, CT Range, Number of poles are set automatically by the software as per the selected setting: User does not have to configure the above settings
Software: NI LabVIEW based for user interface, password protection and user hierarchy, settings selection, automatic testing process control & report generation exported to MS-Excel
Exact trip current wave-form (and not a vague band) and trip time are captured, displayed & recorded on PC
Current setting is instant without any auto transformer movement (Saves time and error due to human handling)
Test results are displayed on monitor and stored against serial number or a bar code
Line Voltage variation has no effect on actual test current
Generation of Reports in MS Excel format or to Print

Output current programmable from 0.5 A to 1250 A for magnetic trip testing of MCB (Automatic Selection via software)
Can test 4 MCBs of single pole OR 2 MCBs of double pole OR 1 MCB of 3 or 4 pole simultaneously for magnetic trip
PC provided: IBM PC / compatible make with NI LabVIEW based TestwareTM
Pressure Required for pneumatic handling: Approximately 6 Bar
Test Procedure (IEC 60898 9.10.2):

1. Continuity Test - To check for correct electrical closing in the event of MCB being made ON externally by a pneumatic ON mechanism
2. Hold Test (No Trip Test) - To check for holding mechanism for at least 0.1 s after passing current of 3 In for B curve, 5 In for C curve, 10 In for D curve MCB
3. Trip Test - To check for tripping mechanism for less than 0.1 s after passing current of 5 In for B curve, 10 In for C curve, 20 In for D curve MCB
500 VA branded UPS

MCB Rating : 0.5 to 63 A, Curve : B, C, D, 0.5 to 125 A, Curve: B and C only. Even smaller variants such as 1 to 630 A can be designed for a limited range of MCBs. The product can further be customised as a microcontroller based semi automatic version (cost effective) or a PC based fully automatic (sophisticated with latest software). The fixtures designed will be specially made with respect to the size, shape and dimensions of the MCB (1-4 pole) provided. Another customized variant includes an R&D based variant wherein the tripping current is gradually increased and the exact tripping level is sensed.

The product is used to conduct test d and e as per table 7, IEC 60898. The test is intended to check the instantaneous trip (magnetic trip mechanism) characteristics of an MCB as per its rating and curve at a conveniently low voltage.