Contactor 40A, 24 V ACDC, 4NO contacts ST40-40-24ACDC

Universal modular contactor for professional electrical installations

The ST40-40-24ACDC contactor is a compact electromagnetic solution designed for demanding industrial applications and building installations. Thanks to the universal control voltage of 24V AC/DC and a high load capacity of 40A, it is suitable for controlling lighting, electric drives, and heating systems alike.

Operating parameters and switching capabilities

The 4×NO (Normally Open) configuration allows for the simultaneous control of four circuits or groups of receivers. A switching power of 24kW for category AC1 allows for safe operation with resistive loads at 230V, while 8.5kW for category AC3 ensures adequate performance when controlling three-phase motors.

The rated operating current of 40A guarantees reliability in medium-power applications, and the wide operating temperature range from -25°C to +50°C enables installation in harsh environmental conditions. An insulation voltage of 4kV ensures user safety in high-voltage installations.

Modular design and ease of installation

The device occupies only 2 modules in width (approximately 35mm) with a mounting depth of 65mm, allowing for efficient space management in distribution boards. Direct mounting on a standard 35mm DIN rail eliminates the need for additional mounting elements.

Screw terminals with a cross-section of 16mm² allow for the connection of wires with significant cross-sections, which is crucial for high-current applications. A red ON-status indicator located in the front window provides immediate device status control without the need for disassembly.

Durability and operational reliability

An electrical switching durability of 1×10⁵ cycles guarantees years of fault-free operation under typical loads, while a mechanical durability of 1×10⁶ cycles demonstrates the robust construction of the moving parts. A coil power consumption of only 6.4W minimizes energy losses during continuous operation.

The IP20 protection rating protects against accidental contact with live parts while maintaining adequate internal ventilation of the device.

Regulatory compliance and operational safety

The contactor meets the requirements of the IEC 61095 standard, confirming its compliance with international electrical safety standards. The utilization category AC-7a/AC-7b according to EN IEC 60947-4-1 defines its purpose for controlling mixed loads (resistive and inductive).

The device is ready for immediate implementation in installations requiring reliable electromagnetic control while maintaining compact mounting dimensions.