Electronic Over Current Relays (EOCR)
Schneider (LT4760M7A) EOCR Electronic Over Current Relay 5~60 A , 200~240 VAC
- LT47, solid state overload relay, compares motor current with preset load current threshold (LOAD).
- Motor currents are monitored through two internal current transformers.
- CT hole size is 12 mm in diameter.
- Please don’t allow excessive force on CTs.
- D-Time counts down and is only available for motor starting.
- During steady state, if motor current is greater than current setting(overloaded), LT47 switches its contacts after O-Time.
For shear-pin (mechanical shock) protection, set O-Time knob
to its minimum in order to trip in 0.2-0.3 s.
|product or component type||Electronic over current relay|
|device short name||LT47|
|relay application||Overload Imax > Isetting
Locked rotor, mechanical jamming I > 3 x Isetting
Sensitivity to phase failure
|[Us] rated supply voltage||200…240 V AC|
|thermal protection adjustment range||5~60A|
|[Ui] rated insulation voltage||Power circuit: 600V AC conforming to CSA
Power circuit: 600V AC conforming to UL
Power circuit: 690V AC conforming to IEC 60947-4-1
|network frequency||50…60 Hz|
|tripping threshold||5…50 A|
|electromagnetic compatibility||Resistance to electrostatic discharge: 8 kV in open air conforming to IEC 61000-4-2
Resistance to electrostatic discharge: 6 kV in direct mode conforming to IEC 61000-4-2
Conducted emission: class A conforming to EN 55011
Immunity to electromagnetic interference: 10 V/m conforming to IEC 61000-4-3
Immunity to fast transients: 2 kV conforming to IEC 61000-4-4
Surge withstand: 6 kV conforming to IEC 61000-4-5
Conducted HF disturbances: 10 V conforming to IEC 61000-4-6
|auxiliary contact composition||1 NO + 1 NC|
|[Ith] conventional free air thermal current||3A for signalling circuit|
|associated fuse rating||3A gG for signalling circuit
3A BS for signalling circuit
|[Uimp] rated impulse withstand voltage||6kV|
|time range||1…120 s – control type R-time
0.3…30 s – control type O-time
|local signalling||1 LED (green)
1 LED (red)
|control type||automatic: reset|
|connections – terminals||Signalling circuit: screw clamp terminals 1 12.5mm – cable stiffness: flexible with cable end
Signalling circuit: screw clamp terminals 1 12.5mm – cable stiffness: flexible without cable end
Signalling circuit: screw clamp terminals 2 12.5mm – cable stiffness: flexible with cable end
Signalling circuit: screw clamp terminals 2 12.5mm – cable stiffness: flexible without cable end
|tightening torque||Signalling circuit: 1.7N.m M3.5|