OVR40150SP datasheet(40/62 Pages) ABB

40 / 62 page

Residual

Curr

ent

Devices

16.38

Low Voltage Products & Systems

1SXU000023C0202 Rev. A

ABB Inc. • 888-385-1221 • www.abb.us/lowvoltage

Test button and Test Wire

When the test button is pressed it allows the correct operation of the

device to be verified by passing a small current through the test wire. This

simulates a leakage to ground by creating an imbalance in the current

transformer (CT).

Test

button

Test

wire

Current Transformer and Sense Circuitry

The current transformer surrounds the neutral and L1 conductors. During

normal operation, all of the current being carried through the L1 conductor

returns up through the neutral conductor. Therefore the currents in the

two conductors are equal and opposite. When a leakage to ground

occurs it causes some of the current to take a path to ground and creates

an imbalance in the current between the two conductors. This imbalance

in current induces a current in the current transformer (CT) which is then

picked up by the sense circuitry. The sense circuitry then actuates the

solenoid and the contacts are forced apart by a spring, terminating the

electricity supply to the device.

Sense

circuitry

Solenoid

Current

transformer

Solenoid

Once an imbalance has been detected by the CT, there is voltage induced

on the CT. The voltage travels through the connected copper wires to the

sense circuitry and the solenoid is actuated. The plunger at the bottom of

the solenoid is then pushed out to trip the breaker.

Sense

circuitry

Current

transformer

Solenoid

Solenoid pin

Application manual

Mechanical operations

RCD Mechanical operation

Main Incoming Supply and Terminals

The main incoming and the grounded neutrals are connected to the

terminals. The operator handle places the RCD in the on and off position

as the position indicator shows.

Position

indicator

Terminals

Operator handle

Terminals

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