MDR-4076

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Part Status:	Active

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Power Relays Over 2 Amps

The MDR-4076 is a typically versatile power relay that is capable of switching circuits under a range of loads and conditions. It has been used extensively throughout various industries and households to provide efficient switch solutions.

Function and Applications

MDR-4076 is a single-phase, SPDT (Single Pole Double Throw) power relay. It has a common, normally open, and normally closed contact, and can be used to switch a load on or off ranging anywhere from 1/10th of an Amp to 2 Amps. This power relay is ideal for use in circuit protection, interfacing with motor starters, or controlling electrical heaters. MDR-4076 power relays are a cost effective and reliable control solution for motor-driven and other electrical devices. Thanks to its impressive contact gap, it is suitable for controlling low-current signals, but also for working with higher current loads such as motors.

Design and Construction

The MDR-4076 power relay features gold-plated contacts which are encased in a glass-filled case that is non-flammable and fire-resistant. The design uses advanced contact technology, making the contacts easy to clean if they become dirty or corroded. This increases the shelf life of the product and ensures excellent long-term performance. The construction of the relay is typically simple, consisting of a control coil, a normally open contact, and a normally closed contact. The control coil is made up of a core and a winding, and is energized by a voltage signal which is applied to its terminals.

Working Principle

When the voltage signal is applied to the input terminals of the normally open contact, the control core and winding become energized. This causes a magnetic field to be generated in the core and winding, and when the field reaches sufficient strength, it actuates the relay switch. When the relay switch is actuated, it closes the normally open contact, and allows current to flow through the circuit. When the input voltage signal is removed, the control core and winding are immediately de-energized, and the magnetic field dissipates. This causes the relay to open the normally open contact, breaking the circuit and preventing further current from flowing.

Conclusion

The MDR-4076 power relay is suitable for controlling low-current signals, as well as controlling motor-driven and other electrical devices. It is constructed from non-flammable and fire-resistant materials, and features gold-plated contacts that are easy to clean and maintain. It works by utilising the principle of magnetic induction, whereby a magnetic field created by an energized control coil actuates the relay switch.

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