Contactor 24-60V AC, 20-60V DC AF38-30-11-11 1SBL297001R1111

Power Supply and Application in Motor Circuits

The AF38-30-11-11 device is a three-pole contactor designed for the safe switching on and off of alternating current (AC) and direct current (DC) circuits. Its key feature is a universal control coil that operates within a wide voltage range: from 24 V AC (for 50 Hz and 60 Hz networks) up to 20–60 V DC. This eliminates the need to select separate versions for different control power sources; a single model is suitable for industrial installations where control voltage may be unstable or originate from various systems.

Under AC-3 operating conditions (squirrel-cage motors), this contactor withstands a rated current of 38 A at 400 V, corresponding to a motor power of 18.5 kW. For resistive loads (category AC-1), its current-carrying capacity increases to 50 A. This design makes the device ideal for controlling pumps, fans, or conveyors where typical starting currents occur.

Construction, Mounting, and Additional Features

The contactor is designed for durability and ease of maintenance. The main electrical circuit is implemented via screw terminals, ensuring reliable contact even at high operating currents. The device dimensions are 45 mm in width, 86 mm in height, and 111.5 mm in depth, allowing installation in standard distribution boards without the need for additional modular adapters.

Note the inclusion of auxiliary contacts. The device features one normally open (NO) contact – useful for switching indication or logical interlocking – and one normally closed (NC) contact, essential in safety circuits or as an "off" status signal. This allows the installer to omit purchasing separate auxiliary modules in simpler applications, simplifying wiring and reducing the number of components in the control cabinet.

Compliance with Standards and Operating Conditions

The device is designed for operation in networks with a working voltage up to 690 V (for both 50 Hz and 60 Hz frequencies). In the NEMA category, its rated power is approximately 18.6 kW, confirming its versatility in international applications.

The practical significance of these data is directly evident in operation: the rated current of 38 A for category AC-3 enables safe switching of motors up to 18.5 kW at 400 V, while the flexible control voltage (range from 24 V AC to 20–60 V DC) eliminates the need for converters or dedicated coils for different power sources. The three main normally open contacts provide full control over the three-phase circuit without requiring expansion with additional contactor modules, and the availability of one normally open and one normally closed auxiliary contact facilitates the implementation of simple signaling and interlocking functions directly on the device body. Screw terminals ensure connection stability for conductors with appropriate cross-sections, necessary for such high current values.

Thanks to its precise construction and compliance with low-voltage requirements, this contactor is a robust component in industrial automation systems, ensuring reliable operation over years of intensive use.