ULKE-S903H Three Phase Relay Tester – Precision & Reliability for Electrical Testing
High-performance secondary current injection test set designed for accurate three-phase relay testing. Features a microcomputer-controlled system with stable output and precise measurements, ensuring reliable protection relay calibration. Constructed with industrial-grade components for durability, including a robust aluminum alloy casing and high-precision current transformers. The intuitive touchscreen interface simplifies operation, while advanced heat dissipation extends device lifespan. Ideal for utility companies, industrial plants, and electrical maintenance teams. Perfect for testing overcurrent, differential, and distance relays in substations and power grids. Buy in bulk for unbeatable wholesale pricing—global shipping available. Trusted by professionals for quality and affordability.