Push Button Switches
ALX-HB4-BG21 Two Position Key Selector Switch | 22mm
22 mm two position key selector switch, key-operated, 1 NO or 1 NO + 1 NC, maintained and key-reset versions, zinc alloy chrome bezel, screw terminals, 600 V AC 10 A.
The HB4-BG21 is a key-operated two position selector: the knob can only be turned with the key in place, so the position cannot be changed by someone walking past the panel. It is used where a mode or an isolation state has to be protected, such as local/remote changeover before maintenance, or a run permission that only a supervisor should be able to give.
Technical Specifications
Item | Specification |
Mounting hole | 22 mm (22.3 mm cutout) |
Bezel / head material | Zinc alloy, chrome plated |
Contact housing | Plastic |
Contact configuration | 1 NO, or 1 NO + 1 NC (by model) |
Operation | Two position, key operated, maintained or key reset |
Actuator | Key barrel with removable key, 22 mm |
Actuator colour | Black |
Illumination | None |
Rated voltage / current | 600 V AC, 10 A (AC-15 duty) as marked on the contact block |
Termination | Screw terminals |
Positions | 2 (left / right) |
Key | Removable; keyed-alike sets available |
BG21 and BG25 are maintained (the key can be withdrawn in either position); BG41/BG45 and BG61/BG65 are key-reset versions. Send the panel drawing and we confirm which key-withdrawal pattern you need.
Design Features
- Key-operated: the selector cannot be turned without the key, so the position is protected from casual change
- Two position, 60 degree throw, with a detent at each position
- Key can be withdrawn, which lets the same key control access to a second panel
- Chrome-plated zinc alloy bezel with anti-rotation key on the collar, so the body stays fixed while the key is turned
- Contact blocks clip on from the rear and are interchangeable with the knob and lever selector versions
Model Options
Model | Action | Contact |
HB4-BG21 | Maintained (stay put) | 1 NO |
HB4-BG25 | Maintained (stay put) | 1 NO + 1 NC |
HB4-BG41 | Key reset | 1 NO |
HB4-BG45 | Key reset | 1 NO + 1 NC |
HB4-BG61 | Key reset | 1 NO |
HB4-BG65 | Key reset | 1 NO + 1 NC |
State the quantity of panels if the keys have to be supplied keyed-alike across the installation.
Applications
Local/remote and auto/manual changeover, maintenance isolation, run-permission selection and access-controlled machine modes.