Overload Relay Suppliers In South Africa
An overload relay is a safety device that protects your circuit against damage caused by high-power loads. The relay opens if the load exceeds a certain amount, protecting the circuit from destruction. The simplest version of an overload relay is a single-pole, single-throw (SPST) switch.
Overload Relay Suppliers In South Africa
What are 2 types of overload relays?
Overload relays are typically one of two types: thermal relays or electrical relays. The overload mechanism inside thermal relays consists of a bimetallic strip in conjunction with a heating element.
What is the difference between MCB and overload relay?
The overload relay operates automatically when the set current exceeds. Here current can be set. MCB is a miniature circuit breaker that is mechanically switched on. It can trip automatically if the current exceeds a preset current.
How do I choose an overload relay for my motor?
The following steps are used in the selection and sizing of the thermal overload relay.
- Step 1: Take the motor size from the motor nameplate.
- Step 2: Compute the Full Load Current of the motor.
- Step 3: Calculate the lower limit of the thermal overload relay by subtracting 20% from the calculated FLC.
Why do we use overload relay?
Overload protection relays prevent motor damage by monitoring the current in the motor circuit and breaking the circuit when an electrical overload or a phase failure is detected. Since relays are much cheaper than motors, they provide an affordable way of protecting motors.