Push Button Switches
ALX-HB4-BD33 Three Position Selector Switch | 22mm
22 mm three position rotary selector switch, 2 NO contact, maintained (stay put) and spring return versions, black knob, zinc alloy chrome bezel, screw terminals, 600 V AC 10 A.
The HB4-BD33 adds a centre position to the HB4 selector: left, centre and right, with a detent at each. Two normally-open contacts are carried, one for each outer position, which makes this the usual switch for a three-state selection such as forward / off / reverse or hand / off / auto.
Technical Specifications
Item | Specification |
Mounting hole | 22 mm (22.3 mm cutout) |
Bezel / head material | Zinc alloy, chrome plated |
Contact housing | Plastic |
Contact configuration | 2 NO |
Operation | Three position, maintained or spring return |
Actuator | Rotary knob, black |
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 | 3 (left / centre / right) |
Mounting | 22 mm single hole, anti-rotation key |
BD33 is maintained (stay put) and BD53 is spring return to centre. Both carry 2 NO contacts, one per outer position.
Design Features
- Three positions with a detent at left, centre and right, so the centre position is repeatable
- Two normally-open contacts, one switched in each outer position, for forward/off/reverse style selection
- Spring return version (BD53) snaps back to centre as soon as the knob is released
- Anti-rotation key holds the collar fixed when the knob is turned hard against its stop
- Same 22 mm bezel and cutout as the two position and key selector versions
Model Options
Model | Action | Contact |
HB4-BD33 | Maintained (stay put) | 2 NO |
HB4-BD53 | Spring return to centre | 2 NO |
For two position selection use the HB4-BD21 group; for a key-operated version see HB4-BG03.
Applications
Forward / off / reverse selection, hand / off / auto mode selection, two-speed motor control and valve position selection on process panels.