Push Button Switches
ALX-HB4-BR21 Mushroom Head Push Button Switch | 22mm 60mm 1NO
22 mm mushroom head push button switch with 60 mm cap and 1 NO contact, momentary spring return, black / green / yellow cap, zinc alloy chrome bezel, screw terminals, 600 V AC 10 A.
The HB4-BR21 group pairs the 60 mm mushroom cap with a normally-open contact. It suits cycle-start and acknowledgement duties on large panels where the target has to be big enough to find by touch, but the command must only be given while the cap is held.
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 |
Operation | Momentary, spring return |
Actuator | Mushroom head, 60 mm dia. |
Actuator colour | Black, green, yellow |
Illumination | None |
Rated voltage / current | 600 V AC, 10 A (AC-15 duty) as marked on the contact block |
Termination | Screw terminals |
Suffix sets the colour: BR21 black, BR31 green, BR51 yellow. The red normally-closed version is HB4-BR42.
Design Features
- Normally-open contact, spring return: the command lasts only as long as the cap is held
- 60 mm cap on a standard 22 mm bezel, so a large target does not mean a larger panel hole
- Three cap colours separate start, acknowledge and jog functions on the same panel
- Metal bezel and clamping ring withstand palm operation and panel vibration
- Clip-on contact block, replaceable from the rear without re-terminating the panel wiring
Model Options
Model | Colour | Contact |
HB4-BR21 | Black | 1 NO |
HB4-BR31 | Green | 1 NO |
HB4-BR51 | Yellow | 1 NO |
Red 1 NC version: HB4-BR42. Both share the 60 mm cap and bezel.
Applications
Crane and hoist control, large machine start stations, gate and barrier control, and outdoor panels operated with gloves.