9A 3P 24V DC Low Consumption Mini Contactor

The Schneider Electric TeSys K LP4K0910BW3 mini contactor is a compact 3-pole contactor with 3 normally open main contacts, designed for motor control and resistive loads in electrical panels where space and control circuit consumption are important factors. It offers a rated current of 9 A in AC-3 and AC-3e categories up to 440 V, can control motors up to 4 kW at 380-415 V, and uses a low-consumption 24 V DC electronic coil with a power draw of just 1.8 W.

The LP4K0910BW3 reference belongs to Schneider Electric's TeSys K range, characterized by its reduced dimensions and high switching capacity. It also incorporates 1 normally open auxiliary contact, screw terminals, DIN rail or panel mounting, and integrated suppression of coil-generated surges, making it easy to integrate into systems controlled by PLCs, relays, controllers, and other electronic devices.

9 A three-pole mini contactor

The Schneider Electric LP4K0910BW3 features a configuration of 3 power poles with 3 normally open contacts. When the coil is energized, the three poles close simultaneously to supply the three-phase load.

In AC-3/AC-3e category, mainly intended for starting and stopping squirrel-cage motors, Schneider Electric specifies a rated operational current of 9 A up to 440 V AC.

Motor up to 4 kW at 400 V

In motor control applications, the permissible rated power depends on the supply voltage.

• 220-230 V AC: up to 2.2 kW.
• 380-415 V AC: up to 4 kW.
• 440 V AC: up to 4 kW.
• 500 V AC: up to 4 kW.
• 660-690 V AC: up to 4 kW.

In a typical 400 V three-phase installation, the LP4K0910BW3 is therefore suitable for motors up to 4 kW, provided that the rated current, starting duty, and utilization category are compatible.

Low-consumption 24 V DC coil

One of the main features of this reference is its low-consumption 24 V DC coil.

Schneider Electric specifies a consumption of approximately:

• Power during energization: 1.8 W.
• Holding power: 1.8 W.

This low consumption makes it easier to control the contactor using properly sized DC power supplies and automation outputs, while also reducing power dissipation inside the panel.

Wide control voltage range

The electronic coil operates at a nominal voltage of 24 V DC and allows a wide operating range.

• Nominal control voltage Uc: 24 V DC.
• Operating range: approximately 0.7-1.3 × Uc.
• Approximate equivalent range: 16.8-31.2 V DC.

This tolerance helps ensure stable operation despite certain variations in the control power supply.

Integrated surge suppressor

The coil incorporates a bidirectional peak-limiting diode suppressor. This electronics helps limit transient overvoltages generated when an inductive load such as the contactor coil is switched off.

Integrated suppression is especially useful when the contactor is controlled by automation electronics, as it reduces the need to add certain external coil protection modules.

1 normally open auxiliary contact

In addition to the three main power contacts, the LP4K0910BW3 includes 1 instantaneous normally open auxiliary contact.

The correct composition is:

• Main contacts: 3 NO.
• Integrated auxiliary contact: 1 NO.

The auxiliary contact can be used for functions such as:

• Self-holding.
• Status indication.
• Feedback to PLC.
• Automation sequences.
• Electrical interlocking.

20 A for AC-1 loads

In addition to motor applications, the contactor can be used with resistive or slightly inductive loads.

Schneider Electric specifies a thermal and operational current of up to 20 A in AC-1 category under the conditions indicated for the product.

This value should not be confused with the 9 A in AC-3, since both categories correspond to different loads and switching requirements.

Utilization categories

The Schneider Electric TeSys K LP4K0910BW3 is specified for different utilization categories:

• AC-1: non-inductive or slightly inductive loads.
• AC-3: normal starting and stopping of squirrel-cage motors.
• AC-3e: updated motor control applications.
• AC-4: certain motor duty cycles with more demanding switching.

The admissible current and electrical endurance must be checked for the specific utilization category.

Power circuit up to 690 V AC

The main circuit is designed to operate with utilization voltages up to 690 V AC, depending on the category and operating conditions.

• Maximum power circuit voltage Ue: 690 V AC.
• Maximum specified frequency: up to 400 Hz depending on configuration.
• Rated insulation voltage Ui: 690 V according to IEC.
• Impulse withstand voltage Uimp: 8 kV.
• Overvoltage category: III.

Making and breaking capacity

The technical documentation specifies a rated making capacity of 110 A AC according to IEC 60947.

The indicated breaking capacity is:

• 220-230 V: 110 A.
• 380-400 V: 110 A.
• 415 V: 110 A.
• 440 V: 110 A.
• 500 V: 80 A.
• 660-690 V: 70 A.

These values correspond to the contactor's switching capacity and do not constitute a short-circuit breaking capacity equivalent to that of a circuit breaker.

External short-circuit protection

The contactor must be used together with properly coordinated short-circuit protection.

Schneider Electric provides, depending on the required coordination, associated fuses of:

• 25 A gG for the power circuit.
• 25 A aM for the power circuit.
• 10 A gG for the signaling circuit.

The final protection must be selected according to the application, expected short-circuit current, and required coordination.

Screw terminals

The LP4K0910BW3 uses screw terminals, providing a conventional and robust connection for power, control, and signaling circuits.

Schneider Electric specifies a tightening torque of approximately 0.8 to 1.3 Nm, depending on the terminal and the type of tool used.

DIN rail or panel mounting

The mini contactor can be installed by:

• DIN rail mounting.
• Direct panel mounting.

This flexibility makes it easy to incorporate into compact panels, machines, and small automation systems.

Extremely compact format

The TeSys K range is specially designed to deliver high performance while taking up very little space.

• Width: 45 mm.
• Height: 58 mm.
• Depth: 57 mm.
• Weight: approximately 0.235 kg.

Its dimensions allow several contactors and control elements to be integrated into enclosures where available space is limited.

Mechanical durability of up to 30 million cycles

Schneider Electric specifies a high mechanical life for this reference:

• Mechanical durability: up to 30 million cycles.
• Electrical durability: approximately 1.3 million cycles at 9 A in AC-3/AC-3e up to 440 V.
• Maximum operating frequency: up to 3,600 cycles per hour.

These features make TeSys K suitable for automatic systems subjected to numerous switching operations throughout their service life.

Operating times

The electromagnetic mechanism offers short switching times:

• Energization and NO contact closing: approximately 30-40 ms.
• De-energization and opening: approximately 10-20 ms.

These values allow the contactor to be integrated into automatic sequences that require fast and repeatable response.

Operating temperature

The Schneider Electric LP4K0910BW3 is designed to operate in:

• Operating ambient temperature: -25 to 50 °C.
• Storage temperature: -50 to 80 °C.
• Operating altitude without derating: up to 2,000 m.

IP20 protection rating

The mini contactor has an IP20 protection rating under the specified installation conditions.

It is intended to be mounted inside an enclosure or electrical panel that provides the required degree of protection against dust, moisture, and accidental contact.

Applications of the Schneider Electric LP4K0910BW3

Thanks to its compact format and low-consumption coil, this mini contactor can be used in numerous control and automation applications:

• Three-phase motors up to 4 kW at 400 V.
• Pumps.
• Fans.
• Small compressors.
• HVAC equipment.
• Compact machines.
• Conveyor systems.
• Automation panels.
• PLC control.
• Compatible resistive loads.
• Systems where reducing control circuit consumption is a priority.

Especially suitable for electronic control

The low coil consumption of 1.8 W is particularly interesting in panels controlled by electronics.

The combination of low-consumption coil, wide voltage range, and integrated peak suppressor makes it easier to integrate the mini contactor into automation systems, although it must always be checked that the output used can supply the required electrical characteristics.

Technical characteristics of the Schneider Electric LP4K0910BW3

• Brand: Schneider Electric.
• Reference: LP4K0910BW3.
• Range: TeSys.
• Family: TeSys K.
• Short name: LP4K.
• Type: power mini contactor.
• Application: motor and resistive load control.
• Number of poles: 3P.
• Main contacts: 3 NO.
• Auxiliary contact: 1 instantaneous NO.
• AC-3/AC-3e current: 9 A up to 440 V.
• AC-1 current: up to 20 A.
• Power at 220-230 V AC-3: 2.2 kW.
• Power at 380-415 V AC-3: 4 kW.
• Power at 440 V AC-3: 4 kW.
• Coil voltage: 24 V DC.
• Coil type: low-consumption electronic.
• Coil consumption: approximately 1.8 W.
• Coil operating range: approximately 0.7-1.3 × Uc.
• Surge suppression: integrated bidirectional peak-limiting diode.
• Maximum power circuit voltage: 690 V AC.
• Insulation voltage Ui: 690 V according to IEC.
• Impulse withstand voltage Uimp: 8 kV.
• Overvoltage category: III.
• Making capacity: 110 A AC.
• Terminals: screw.
• Mounting: DIN rail or panel.
• Tightening torque: 0.8-1.3 Nm.
• Width: 45 mm.
• Height: 58 mm.
• Depth: 57 mm.
• Weight: approximately 0.235 kg.
• Protection rating: IP20.
• Mechanical durability: up to 30 million cycles.
• Electrical durability AC-3: approximately 1.3 million cycles.
• Maximum switching frequency: 3,600 cycles/h.
• Closing time: 30-40 ms.
• Opening time: 10-20 ms.
• Operating temperature: -25 to 50 °C.
• Storage temperature: -50 to 80 °C.
• Altitude without derating: up to 2,000 m.
• EAN: 3389110428582.
• Main standard: IEC/EN 60947.

Motor control with a coil of only 1.8 W

The Schneider Electric TeSys K LP4K0910BW3 combines 9 A in AC-3/AC-3e, the ability to control motors up to 4 kW at 400 V, and a 24 V DC electronic coil that consumes only around 1.8 W. These features make it possible to create compact and efficient switching circuits, especially useful in DC-powered automation systems.

Its dimensions of just 45 × 58 × 57 mm, the integrated NO auxiliary contact, electronic coil surge suppression, and mechanical durability of up to 30 million cycles complete a solution especially suitable for machinery, infrastructure, HVAC, and control panels with limited space.

Important: the LP4K0910BW3 is a switching and control device and does not provide its own protection against overloads or short circuits. In motor applications, it must be combined with a motor protection circuit breaker, overload relay, fuses, or a properly selected circuit breaker. It must also be verified that the output used to drive the 24 V DC coil can supply the required electrical characteristics.