TF42-38 Thermal overload relay 1SAZ721201R1055

Thermal overload relay TF42-38 is a protective device designed to protect electric motors from overloads and phase failures. This device, also identified by catalog number 1SAZ721201R1055, is widely used in industrial and construction installations, providing reliable protection for electrical circuits. It is compatible with AF09 to AF38 series contactors, simplifying its integration with existing systems.

Characteristics and Application

The TF42-38 relay features a current setting range of 35 to 38 A, allowing for precise matching to the protected circuit. It has a tripping class of 10, meaning it responds to overloads within a specified time, providing effective protection against motor damage. A built-in reset button allows for quick restoration of operation after removing the cause of the relay's activation. Automatic reset is also available as an option. The device is designed for direct mounting and offers a choice between automatic and manual reset.

Functionality and Construction

The relay is equipped with one normally open (NO) auxiliary contact and one normally closed (NC) and one changeover contact, enabling device status signaling and remote circuit control. Its construction provides resistance to environmental conditions and compliance with IEC/EN 60947-1 safety standards. An important element is also temperature compensation in the range of -25°C to +60°C, which ensures stable operation under various conditions. This ensures that the relay maintains its parameters regardless of the ambient temperature – which is particularly important in industrial applications exposed to variable working conditions.

Key Advantages

• Wide adjustment range: Precise matching to the protected circuit (35-38A).
• Versatility: Compatibility with AF09-AF38 contactors simplifies integration with existing installations.
• High reliability: Tripping class 10 guarantees effective protection against overloads.
• Status signaling: Availability of NO and NC auxiliary contacts enables monitoring of device operation.
• Temperature compensation: Stable operation over a wide temperature range (-25°C to +60°C).
• Ease of use: Built-in reset button and choice of automatic or manual reset simplify operation.
• Safety: Compliance with IEC/EN 60947-1 standards ensures safe device operation.