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The NXRJ-500S motor protector tester is applicable for:  

  1. Suitable for testing various types of low-voltage motor protectors and thermal relays. 2. Tests whether motor protectors provide effective protection during operation. 3. Ideal for laboratory testing of low-voltage motor protection devices. 4. Used by manufacturers for product quality verification and factory testing/commissioning of motor protectors. 5. Applicable for R&D, testing, and teaching purposes in universities and research institutions.  
  Key features and technical specifications of the NXRJ-500S motor protector tester:  

1. Applicable to single-phase and three-phase thermal relays, as well as various active or passive motor protectors, for overvoltage, overcurrent, phase loss, imbalance, locked rotor conditions, and time testing. It can also measure the operating current of current relays and the operating time of rated current.   

◆ Supports sustained current output ranging from 0-50A or 0-500A

◆ Enables balanced three-phase current output with fine-tuning capability

◆ Provides balanced three-phase voltage output with fine-tuning function

◆ Synchronized testing of thermal relay or thermocouple activation time

◆ Automatic identification of normally open/closed contacts

◆ Multiple calibration units can be connected in series simultaneously for enhanced operational efficiency

the key technical indexes

Power input: AC 380/220V 50Hz three-phase four-wire

Instrument class: Class 0.2

Output current: 3×50A or 3×500A

Output voltage: Grounded 3×450V, Phase 3×900V
Time measurement range: 0.0001S to 99999.999S, with precision of 0.001S.

Three-phase Thermal Relay Selection Table for Qingdao Naxin Xiangyuan Electrical Equipment Co., Ltd.
 

1. In 2013, all original equipment underwent comprehensive upgrades: the electric stopwatch was upgraded to 0.001-99999.999S precision, and the ammeter was upgraded to a 5-digit display with 0.2% accuracy.

2. New products including the NXRJ-500SH, NXRJ-500T, NXRJ-500VA, and NXRJ-500EP were launched, marking a milestone for the nation's sole manufacturer of thermal relay testers.

3. By 2014, all new instruments adopted six-digit half-display LCD screens with yellow backgrounds and bold black text, ensuring crystal-clear visibility even in sunlight.

4. In the second half of 2014, the company introduced a new generation of high-current generators and three-phase thermal relay testers using advanced German constant current technology, IGBT modules, and PWMN technology, offering adjustable current ranges from 0 to 50,000A and customizable configurations.

5. All 2014 model instruments were upgraded to 6-digit semi-dial displays with LCD screens.

6. In 2015, a groundbreaking large-current generator was successfully developed using cutting-edge German constant-current technology, IGBT modules, and PWMN technology, marking China's first domestically developed three-phase thermal relay tester.

7. In 2017, a thermal relay tester and motor protector tester were introduced based on linear power amplifier technology, featuring high precision, phase-shifting capability, variable frequency operation, and harmonic output!

The following is the selection table for three-phase thermal relay testers from Qingdao Naxin Xiangyuan Electrical Equipment Co., Ltd.

Current range: 0–50000A, customizable