Measuring 36 x 21 x 24 mm, RF1 Series is designed for control of resistive loads. Zero switching type RF1A switches ON when voltage crosses AC sine wave’s zero crossover point, while instant-ON type RF1B switches ON at instant when control voltage is applied. Relays are rated for up to 25 A load current, up to 280 Vac line voltage, and 5, 12, or 24 Vdc control voltage. Integrated transils protect against over-voltage, while green LED indicates presence of control voltage.