5-1393139-3

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Power Relays, Over 2 Amps: 5-1393139-3 Application Field and Working Principle

When higher power loads need to be controlled remotely – such as in industrial, commercial and HVAC applications – power relays providing control over 2 Amps or higher are required. One such device is the 5-1393139-3 power relay, known for its high current and reliable control of single-phase, two-pole, machine-tool applications. In this article, we\'ll take a closer look at the 5-1393139-3\'s field of application and the underlying working principle.

Application Field

The 5-1393139-3 is a two pole, switchable, hermetically sealed, bifurcated-coil power relay. Specifically designed for gate valve operation, the 5-1393139-3 is ideal for controlling motor loads of up to 15 Amps and can start electric motors up to 1.5 horsepower. It is best suited for use in two hot lead single phase, two pole, machine-tool applications. The device can also be used in small industrial, commercial and HVAC applications.

The application field is also heavily dependent on temperature. When used in ambient temperature of 45°C, the 5-1393139-3 can operated up to 85°C. When used in higher ambient temperatures of 70°C, the device’s operating temperature drops to 70°C (or lower depending on the application).

This device features a ‘B’ bracket for panel mounting, and with standard dimensions of 32 mm x 70 mm x 83 mm (1.25 in x 2.76 in x 3.23 in), the 5-1393139-3 is a compact, convenient unit.

Working Principle

As expected in any power relay, the 5-1393139-3 is based on the standard switching principle of a basic electromechanical switch. An electromagnet (present in the device’s bifurcated-coil) is energized when electricity is provided to one of its ends. This results in the production of an electromagnetic field, which, in turn, exerts a pulling force on the device’s internal armature and switch, causing the device to close the circuit or open it. The 5-1393139-3 relies on this action to control the power load dependent on the requirement.

To ensure reliable and continuous control, the 5-1393139-3 features silver-nickel alloy contact fingers along with bronze-brazed contacts. These properties improve the device’s performance in the areas of high temperature and high voltage switching. Furthermore, the increased resilience to oxidation prevents degradation of the contacts even in extreme environment.

The switching action of the 5-1393139-3 power relay is initiated by a trigger signal, which can come from either an external contactor pressure switch or a function module. This trigger signal, in turn, activates the electromagnet and the relay’s operational sequence takes over from there.

Conclusion

The 5-1393139-3 power relay is specifically designed for controlling larger loads for single-phase two-pole machine-tool applications. The device’s working principle is based on the standard switching principle of a basic electromechanical relay, wherein an electromagnet is used to create an electromagnetic field that activates the relay’s internal armature and switch. Additionally, its silver-nickel alloy contact fingers along with bronze-brazed contacts ensure reliable performance even in extreme environmental conditions. In all, the 5-1393139-3 provides a solid, cost-effective power relaying solution.

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