LC1D18R7 SQUARE D, LC1D18R7 Datasheet - Page 225

• Manufacturer Part Number: LC1D18R7
• Description: IEC Contactor
• Manufacturer: SQUARE D

Specifications of LC1D18R7

• No. Of Poles: 3
• Contact Configuration: 3PST-NO
• Relay Mounting: DIN Rail
• Coil Voltage Vac Nom: 440V
• Relay Terminals: Screw Clamp
• Width: 45mm
• Coil Resistance: 2.24kohm
• Nom Operating Power: 10kW
• External Width: 45mm
• Operating Voltage: 600VAC
• Switching Power Ac1: 3hp
• Switching Power Ac3: 15hp
• Switching Current Ac1: 32A
• Switching Current Ac3: 18A
• Load Current Inductive: 18A
• Load Current Resistive: 32A
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Magnetic Latching Contactors - Characteristics
Magnetic latching contactors of both block and bar mounted types include a special electromagnet
which enables them to remain in the “on” position when the coil is no longer energized.
The special properties of magnetic latching contactors make them suitable for a large number of
applications:
Properties
• Retention of the sequence memory in automatic control equipment in the event of a control circuit
• Energy saving, since the source of supply to the coil does not need to supply current when the
• Change of state from “Closed” to “Open” by current signal through the coil.
• Unaffected by line interference.
• Utilization of contactors beyond their breaking capacity as operations are performed off Load.
• Contactors are silent in the latched position.
Applications
• Refineries, power stations, excitation circuits.
• Contactors remaining in the closed state for long periods.
• Selective opening control.
• No unwanted opening and closing of the main power poles.
• Current carrying at voltages up to 1000 Volts.
Operation of the electromagnet
CR1F contactors
CR1F magnetic latching contactors include a double coil with 3 terminals comprising a latching winding
and an unlatching winding. The 2 windings have a common point which can necessitate special wiring
precautions when the latching supply is separate from the unlatching supply.
The power supplies may be AC or DC. For DC operation, the polarities indicated must be complied with.
Operating precautions:
• the 2 windings must not be energized simultaneously,
• a winding must not be energized continuously,
• supply to the coils must be via momentary contacts.
Manual opening: If the control voltage is not present, the contactor can be unlatched manually.
CR1B contactors
CR1B magnetic latching contactors included a single coil, supplied with DC or AC through a rectifier.
Latching is obtained by direct supply of the coil in one direction of current flow.
Unlatching is obtained by a reverse current, adjusted by resistors.
LC1D contactors
For applications using smaller contactor sizes than those described in the following pages, it is possible
to obtain the same function by the addition of a mechanical latching block type LA6DK, which can be
mounted on LC1D contactors (information on D-line contactors starts on page 79).
failure.
contactor is latched in the closed state.
Example: refineries, power supplies, low voltage distribution.
Magnetic Latching Contactors – Characteristics
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