On-delay time relays for pre-heating and delayed start of system parts

With an on-delay timer, timing begins when the operating voltage is applied, and the output contact moves to the work position only after the set delay has elapsed. DOLD on-delay relays handle forward switching tasks such as pre-heating, as well as delays in switching systems, for example switching on system parts with a time lag in burner controls, escalators and elevators.

The range covers several housing sizes. For tight panels, the 17.5 mm IK 7813, SK 7813, IK 7814 and SK 7814 have one changeover contact and reach 60 min or 640 min, while IK 7825 adds a manual pushbutton and 16 A contacts. IK 8808 is a two-wire timer with a thyristor output for 10 ... 800 mA. At 22.5 mm, BC 7930N and BC 7934N are dual-voltage units reaching 10 h and 16 h, and MK 9906N spans 0.05 s to 300 h with two changeover contacts, one of which can be set as instantaneous.

Where a visible countdown helps, AA 7610, EC 7610 and EF 7610 and the AA 7616, EC 7616, EF 7616 and EH 7616 types go up to 60 h, combining a delayed and an instantaneous contact, with a no-voltage safe version as an option. IK 9906, SK 9906 and MK 9906N accept AC/DC 12 ... 240 V and can be controlled by 2-wire proximity sensors, and BA 7905 runs on up to DC 220 V with no series resistor.

• Timing starts when supply voltage is applied
• Pre-heating, burner controls, escalators and elevators
• 17.5 mm IK 7813 / SK 7813 for compact panels
• MK 9906N covers 0.05 s to 300 h
• 7610 and 7616 types with time display, up to 60 h
• IK 8808 two-wire timer with thyristor output