Overview
The Control Concepts CI2120-B is an industrial-grade zero speed switch that detects rotational stoppage and speed deviation in shaft-driven equipment. This SPDT (single-pole, double-throw) model combines electromechanical design with robust cast iron housing to deliver dependable operation across conveyor systems, pump drives, fan interlocks, and process machinery requiring motion verification.
Key Features
- Zero speed detection—monitors shaft rotation and signals when motion stops
- Speed range 24–2000 RPM with adjustable trip points available in variant models
- Single-pole, double-throw (SPDT) contact configuration for make/break circuit control
- Cast iron housing provides corrosion resistance and durability in industrial environments
- Base-mount design enables easy installation on motor frames and gearbox housings
- Detects mechanical failure, overload conditions, speed changes, overspeed, and reverse rotation
Technical Specifications
- Model: CI2120-B
- Manufacturer: Control Concepts / DAZIC
- Switch Type: Zero speed switch, electromechanical
- Contact Configuration: SPDT (1NO/1NC)
- Speed Range: 24–2000 RPM
- Housing Material: Cast iron
- Mounting: Base mount
- Shaft Diameter: 1/2″ (1.27 cm)
- Weight: Approximately 8 lbs (cast iron variant)
- Operating Principle: Centrifugal force activation
Typical Applications
The CI2120-B is commonly used in:
- Conveyor Systems: Interlock switches that stop downstream equipment if upstream belt motion fails
- Motor Drive Protection: Detect mechanical jams, belt slippage, or coupling failures
- Pump & Fan Drives: Verify continuous shaft rotation; signal failure or cavitation
- Gearbox Monitoring: Confirm torque transmission and detect gear tooth breakage
- Process Machinery: Spindle drives, mixer motors, and any shaft-critical application requiring motion assurance
- Safety Interlocks: Prevent unsafe equipment startup or downstream operation if primary motion stops
Compatibility & Replacements
Compatible With
- AC motor control circuits (230V, 460V, 3-phase)
- DC control circuits (125V, 250V DC variants available)
- Programmable Logic Controllers (PLCs) via relay outputs
- Contactors, starters, and alarm/signal devices via SPDT contacts
- Base-mounted motor frames and gearbox housings
- Industrial automation systems and safety control interlocks
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering, as Control Concepts offers multiple CI2120 variants (CI2120-A4B, CI2120-5-B, CI2120A1B) with different voltage ratings, adjustability, and contact configurations. The CI2120-B base model suits applications with fixed 24–2000 RPM detection.
Works With
- Traditional hard-wired motor control relay logic
- 24VDC and 120VAC auxiliary control circuits
- PLC discrete input modules (via dry contact relay output)
- Alarm and shutdown signal circuits
- NEMA-compliant industrial control panels
