High Voltage RelayRL 21 The RL 21 High Voltage Relay is designed to reliably switch voltages of up to 6,000 VAC while handling high load currents. At the same time, it is capable of switching very low voltages in the millivolt range and currents in the milliampere range, placing extremely high demands on contact quality and stability. Engineered for industrial applications, the relay ensures long service life and dependable performance. It is primarily used in combined safety and functional test systems for electrotechnical products, where several kilovolts are switched during high-voltage testing and currents of up to 30 A occur during functional testing. Precise resistance measurements in the milliohm range, for example in motor testing, are also supported. Proven electromechanical relay technology makes the RL 21 a robust and reliable solution for system integration and control cabinet applications. High Voltage Relay RL 21 | 05.2026 Subject to change and error. Please note: that in Europe, we use a comma as the separator, while in the USA, a period is used.