DOLD delayed-on time relays are used for controlled start-up of loads after a set time has elapsed. They are commonly used in industrial automation systems, building installations, HVAC systems, fans, lighting systems, as well as in machines and production lines. They enable sequential switching of circuits, reduction of starting currents and protection of components against overload.

These types of DOLD time modules allow for precise setting of delays from 0.05 seconds up to 300 hours, depending on the model. Depending on the version, models with 1 or 2 changeover contacts (C/O) are available, as well as variants with thyristor (Ty), transistor (T) or digital display.

Models available at ELTRON:

• MK9906N, IK9906, BC7930N, BC7934N – universal relays with a wide supply voltage range (12–240 V AC/DC), ideal for general applications in switchboards and control cabinets.
• MK7858, MK7803, EC9621 – models with a wide time range and/or built-in digital display, designed for applications requiring visual parameter control.
• IK8808 – relay with thyristor output, used in applications requiring fast response and precise load control.
• EH7616, AA7512, EC7801 – advanced relays with operating time counters or mechanically adjustable delay, often used in HVAC automation, alarm systems and machines.

Key advantages of DOLD relays:

• Wide time range – flexible adaptation to the application.
• Wide range of supply voltages – from 12 V DC to 240 V AC.
• Compact versions – housings from 17.5 mm, easy mounting on DIN rail.
• Options with counter or display – simplified configuration and operation control.

All DOLD time relays are available from ELTRON, the official distributor of the brand. We offer not only availability from stock, but also technical advice and assistance in selecting the right model for your specific application.