Siemens | Sirius ACT Metal Round Push-button 22mm 500V AC/DC | Blue Flat Momentary
The Siemens PB-M-BLU is a 22mm round push-button on the metal Sirius ACT line, rated 5V to 500V AC or DC with a thermal current of 10A. The PB-M-BLU is supplied as a complete unit: a blue flat momentary actuator, a high-gloss metal front ring in silver, a metal holder, and one normally open contact module on screw terminals. It carries the Siemens article number 3SU1150-0AB50-1BA0. Front-plate protection is IP66, IP67 and IP69(IP69K), with IP20 at the terminals.
Operator stations on a production line take repeated impact from trolleys, tooling and daily handling, and the front ring is the component that fails first. A cracked plastic bezel compromises the seal, exposing the enclosure to the dust and water the rating was specified to exclude. The PB-M-BLU surrounds the actuator with a metal front ring and a metal holder, and still seals to IP66, IP67 and IP69K on the front-plate side. Siemens rates mechanical and electrical endurance at a typical 10 million switching cycles.
Panel builders select the metal line for equipment that customers actually see. The high-gloss silver ring presents the PB-M-BLU as finished switchgear rather than a commodity fitting, which justifies the modest price step over the plastic equivalent. The 22.3mm round cutout is the standard punch dimension across the entire Sirius ACT range, so the metal button occupies the same aperture as the plastic actuators already installed. Termination is identical: screw terminals accept two conductors up to 1.5mm2 at 0.8 to 0.9 N.m, so a mixed panel requires one screwdriver and one torque setting.
Features
- Metal high-gloss front ring — the PB-M-BLU uses a silver metal front ring rather than the plastic bezel fitted to the plastic Sirius ACT line.
- Metal holder — the holder that clamps the unit to the front plate is metal, listed by Siemens under article number 3SU1550-0AA10-0AA0.
- 22mm round flat actuator — blue plastic button with an outer diameter of 29.45mm, operating on momentary contact so the circuit makes only while it is held.
- Complete unit supply — the PB-M-BLU ships with the actuator, metal front ring, metal holder and one NO contact module under one part number.
- 500V AC/DC rating — rated operating voltage runs 5V to 500V at AC 50Hz, AC 60Hz and DC, with a 500V rated insulation voltage.
- 10A thermal current — carries 10A, with a 10A continuous current listed behind a C-characteristic MCB where prospective short-circuit current stays below 400A.
- IP66, IP67 and IP69K front protection — the front-plate side resists dust ingress, temporary immersion and high-pressure, high-temperature wash-down.
- IP20 at the terminals — terminal-side protection is IP20 only, so the PB-M-BLU depends on the panel behind the front plate for enclosure rating.
- NEMA type ratings — carries NEMA 1, 2, 3, 3R, 4, 4X, 12 and 13 alongside the IP figures for panels built to export specification.
- 10 million switching cycles — Siemens lists typical mechanical and electrical endurance at 10 million operations, at up to 3600 operations per hour.
- Screw terminal connection — accepts 2 x 1.0 to 1.5mm2 solid or 2 x 0.5 to 1.5mm2 finely stranded conductors, tightened to 0.8 to 0.9 N.m.
- -25 to +70 deg C operating range — rated for operation from -25 to +70 deg C and storage from -40 to +80 deg C, at pollution degree 3.
Where to use
- Machine control panels — the PB-M-BLU mounts into a 22.3mm punched hole on the front plate of a machine control station.
- High-traffic operator stations — the metal front ring suits buttons that take knocks from trolleys, tooling and daily handling.
- Wash-down food and beverage plant — IP69K front protection suits process areas cleaned with high-pressure, high-temperature water.
- Outdoor and exposed plant — IP66 and IP67 front sealing covers pump stations, irrigation control and other panels open to dust and rain.
- Motor start and reset stations — one NO contact module suits a start, jog or reset function wired into a control circuit up to 500V.
- Customer-facing machinery — the high-gloss silver ring gives the PB-M-BLU a finished look on equipment that gets shown to buyers or auditors.
- Marine and shipping switchgear — the PB-M-BLU carries marine and shipping test certificates listed on the Siemens datasheet.
- Export-specification switchboards — NEMA 4X and 12 type ratings suit panels built for North American sites.
The PB-M-BLU is not an illuminated push-button: the datasheet lists no light source and zero LED modules. It is also momentary contact only, so it does not latch or hold a maintained position. Siemens lists product function positive opening as No, so the PB-M-BLU is not specified for emergency stop duty. The datasheet for the metal line does not list a railway rating to DIN EN 61373, so check the specification before using it on rolling stock.
