PC-controlled three-station overload relay test bench for IEC-referenced trip-time, current, I2t, and temperature evaluation.

The 3-Station Overload Relay Test Bench is a guarded, PC-controlled system for IEC 60947-4-1-referenced laboratory evaluation of overload relays. It supports repeatable trip-time testing, controlled test sequencing, temperature monitoring, and digital result recording for quality laboratories, product R&D teams, and engineering validation environments.

Key Capabilities:

• Three dedicated DUT stations for efficient laboratory testing.
• One selected test sequence can be applied to up to three compatible overload relays at the same time.
• Recipe-based PC operation for repeatable test settings and guided execution.
• Supports configured overload-relay ranges from 0.47-0.75 A and 22-30 A.
• Suitable for overload-relay trip classes 10, 20, 30, and 40.
• Three-phase AC current source rated up to 300 A.
• Trip-time, I2t, current, trip feedback, temperature, and result-status recording.
• 24 thermocouple channels for test and equipment temperature monitoring.
• Guarded DUT area with monitored safety functions.

IEC-Referenced Test Modes:

The software provides range-specific recipes for A+B, C, and D test points used in overload-relay evaluation. The applicable current setting, trip class, ambient condition, test duration, and acceptance criteria are selected according to the DUT characteristics and approved test procedure.

• A+B: Reference and overload operating points, as applicable to the relay type.
• C: Defined moderate-overload trip evaluation.
• D: High-overload trip-class evaluation, commonly associated with the applicable IEC test point.

PC-Based Operation:

The operator selects the required recipe, follows the software-guided current-source setup, and starts the test after the guarded setup is confirmed. The system monitors safety status and trip feedback during execution, then presents the recorded trip time, I2t result, temperature data, and pass/fail status for review.

Typical Applications:

• Overload-relay quality verification
• Laboratory characterization and comparison
• Product R&D and engineering validation
• Relay characteristic comparison
• Controlled recording of trip-time and thermal test results

Standards Reference:

The test bench supports IEC 60947-4-1-referenced evaluation of overload-relay current settings, time-current characteristics, all-pole operation, and two-pole or phase-loss operating limits. The applicable standard edition, DUT manufacturer characteristics, test conditions, and approved test plan govern final acceptance. This product information describes test-bench capability and does not itself constitute IEC certification.

Download Datasheet: 3-Station Overload Relay Test Bench