Model 7J and 7K Switch Circuit Controllers

Built tough for the rail industry, the Model 7 series controllers deliver high sensitivity, reliability, and the rugged strength needed to perform in harsh environments. Designed to detect device positions, these controllers are commonly used at switch points – but also work with derails, bridge locks, slide detectors, and more.

Key Features

• Proven mechanical design trusted for decades
• High-integrity switch position feedback
• Rugged construction for harsh rail environments

Customer Benefits

• Enhance operational safety with dependable position detection
• Long service life reduces total cost of ownership
• Trusted by freight and passenger operators worldwide

Built to Detect. Designed to Last.

The Model 7 can be used to shunt track circuits or control relay circuits, depending on system needs. Its durable arched cast-iron case offers superior strength, protects internal components, and provides full access for maintenance.

What makes the Model 7 stand out:

• Highly sensitive mechanisms detect even small movements.
• Vibration-resistant design ensures contact points stay secure.
• No contact chatter thanks to parallel cam and camshaft rotation.
• Long-lasting performance with no wear from vibration.

In the Model 7J, cam and spring pressure keep front contacts tight and reliable. The Model 7K adds dual pressure to maintain both front and back contacts securely closed. In both designs, the contact fingers only move when the crank position changes – not from vibration or case movement.