PowerOptimal PowerGuard RL20-1 specification INTRODUCING THE PowerGuard® RL20-1 PowerGuard RL20-1 is a DIN-rail mount relay primarily designed for use in conjunction with the PowerGuard DPM20-8 demand control unit. Contacts are activated by a DC voltage which is opto-isolated from the control circuit. The contact configuration switches the mains live circuit to the output when energised. This unit is designed and manufactured in South Africa. SPECIFICATIONS SPECIFICATIONS Input power: 230Vac Control voltage: 5 – 48 Volt DC Size: DIN standard, 48mm wide