Modex Automation – TR40 – Interval Timer Relay, 8-Pin Plug-In, AC/DC Variants

The Modex Automation TR40 is an interval timer relay designed for industrial automation and process control applications requiring precise timing functions. Housed in an 8-pin plug-in case, the TR40 provides a timed output interval upon energization, making it ideal for machinery sequencing, process delays, and safety interlocks. The TR40 was available in both AC and DC supply variants, supporting flexible integration into various control systems.

AC supply variants of the TR40 were discontinued in January 2000, and DC variants in January 2003, but the relay remains notable for its robust design and reliable operation in legacy installations. The TR40 shares its form factor with other Modex TR series timers, featuring a plug-in base for quick replacement and maintenance.

Key Features:

• Function: Interval timer (output remains on for a set period after energization)

• Mounting: 8-pin plug-in case for easy installation and replacement

• Supply voltage: Available in AC and DC variants (discontinued)

• Adjustable time range: (Model-dependent; typically set via external or recessed potentiometer)

• Robust industrial design for long service life

• Compatible with standard 8-pin relay sockets

• Ideal for machinery sequencing, process delays, and safety timing