LC1D09BD SQUARE D, LC1D09BD Datasheet - Page 31

• Manufacturer Part Number: LC1D09BD
• Description: CONTACTOR, 3PST-NO, 24VDC, 20A, DIN RAIL
• Manufacturer: SQUARE D

Specifications of LC1D09BD

• No. Of Poles: 3
• Contact Configuration: 3PST-NO
• Relay Mounting: DIN Rail
• Coil Voltage Vdc Nom: 24V
• Width: 45mm
• Relay Terminals: Screw Clamp
• Contact Voltage Ac Max: 600V
• Operating Voltage: 600VAC
• Switching Power Ac1: 1hp
• Switching Power Ac3: 7.5hp
• Switching Current Ac1: 25A
• Switching Current Ac3: 9A
• Load Current Inductive: 9A
• Load Current Resistive: 25A
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

01/04
Telemecanique offers a line of contactors for applications involving DC control circuits. It does not matter
whether the power circuit is AC or DC. There are two considerations when using these contactors in
applications involving a DC power circuit:
1. Voltage per pole must not be exceeded.
2. L/R
On D-line contactors, you can use the AC inductive/resistive rating as long as the voltage does not
exceed 75 volts per pole. On F-line contactors, the voltage must not exceed 125 volts per pole.
However, by wiring the contacts in series, you can multiply the number of poles in series by the
maximum voltage allowed per pole.
Example 1: D-Line contactors (9 - 38 amps)
A time constant is defined as the length of time it takes the current to rise from 0 to 63.2% of its
maximum value, or to decay to 36.8% of its maximum value. Time constants are measured in
seconds. The inductance (L) is measured in henries and the resistance (R) is measured in ohms.
In a pure resistive circuit, current reaches its maximum value when the circuit is energized. Because
inductance opposes a change in current flow and tends to hold back current, the time constant will
increase as the circuit inductance is increased. As the time constant exceeds 15 ms, the electrical
life of the contactor is affected and a derating factor (normally one contactor size) is needed to
compensate for this loss. In most applications this time constant will be under 15 ms. It is a good
idea, however, to check with the motor manufacturer.
On AC power circuits, follow regular procedures.
75 volts
15 ms without derating.
150 volts
Contactor Selection for Utilization Categories DC-1 to DC-5
225 volts
300 volts
Example 2: F-Line & D115, D150 contactors
©
125 volts
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250 volts
375 volts
500 volts
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