SIEMENS
Metal emergency stop enclosure with yellow top, protective collar, 40 mm red mushroom pushbutton (rotate-to-unlatch), 1 NC + 1 NC screw terminal, round 22 mm design, with M20 top and bottom entries—ideal for industrial machine safety applications.
Backorder available · Factory lead time 2–3 weeks.
The Siemens 3SU1851-0NB00-2AC2 is a high-performance emergency stop pushbutton enclosure designed for maximum safety in industrial control applications. Built with a durable metal housing and a bright yellow top, it ensures maximum visibility and long-lasting reliability. The integrated 40 mm red mushroom Emergency Stop button with a rotate-to-unlatch mechanism delivers fast response and intuitive operation during critical moments.
Engineered for industrial environments, the device features 1 NC + 1 NC contacts, screw terminals, a protective collar, and M20 entries on the top and bottom. Ideal for floor mounting and harsh conditions, this Siemens enclosure ensures safe and efficient machine control.
High Safety Assurance – Large, easy-to-operate 40 mm Emergency Stop mushroom pushbutton.
Long-Lasting Durability – Heavy-duty metal enclosure designed for industrial use.
Improved Visibility – Yellow top section ensures the emergency stop is easy to locate.
Fast & Reliable Operation – Rotate-to-unlatch mechanism prevents accidental resets.
Flexible Installation – 1×M20 entry at both top and bottom for simplified wiring.
Enhanced Protection – Protective collar prevents accidental activation.
Control Point: 1 (metal)
Pushbutton Type: Emergency Stop, 40 mm mushroom, red
Release Method: Rotate-to-unlatch
Contacts: 1 NC + 1 NC
Terminal Type: Screw terminal
Mounting Style: Floor mounting
Enclosure Material: Robust metal
Entry Points: 1xM20 on top & 1xM20 on bottom
Color: Yellow enclosure top with red E-Stop
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| SKU / Model | 3SU1851-0NB00-2AC2 |
|---|---|
| Brand | SIEMENS |
| product brand name | SIRIUS ACT |
| product designation | Enclosures |
| product type designation | 3SU1 |
| manufacturer's article number | - |
| ● of supplied contact module | A1 = 3SU1400-2AA10-1CA0, A2 = 3SU1400-2AA10-1CA0 |
| ● of supplied contact module at the command point A 1 | 3SU1400-2AA10-1CA0 |
| ● of supplied contact module at the command point A 2 | 3SU1400-2AA10-1CA0 |
| ● of the supplied holder | A = 3SU1550-0AA10-0AA0 |
| ● of the supplied holder at the command point A | 3SU1550-0AA10-0AA0 |
| ● of the supplied actuator | A = 3SU1050-1HB20-0AA0 |
| ● of the supplied actuator at the command point A | 3SU1050-1HB20-0AA0 |
| ● of supplied empty enclosure | 3SU1851-0AA00-0AC2 |
| design of the housing | with protective collar |
| shape of the enclosure front | Square |
| material of the enclosure | metal |
| number of command points | 1 |
| product component | - |
| ● EMERGENCY STOP device | Yes |
| ● protective collar | No |
| color of the enclosure top part | yellow |
| delivery state | - |
| ● as a kit | No |
| ● pre-wired on strip terminal | No |
| fastening method of the enclosure | Vertical |
| design of the actuating element | Emergency stop mushroom pushbutton |
| suitability for use EMERGENCY OFF switch | Yes |
| product feature lockout | No |
| product extension optional light source | No |
| color of the actuating element | red |
| material of the actuating element | plastic |
| shape of the actuating element | round |
| number of contact modules | 2 |
| type of unlocking device | A = rotate-to-unlatch mechanism |
| product component front ring | No |
| design of the front ring | Standard |
| material of the holder | Plastic |
| number of LED modules | 0 |
| product function | - |
| ● positive opening | Yes |
| ● EMERGENCY OFF function | Yes |
| ● EMERGENCY STOP function | Yes |
| protection class IP | IP66, IP67, IP69(IP69K) |
| degree of protection NEMA rating | 1, 2, 3, 3R, 4, 4X, 12, 13 |
| shock resistance | - |
| ● acc. to IEC 60068-2-27 | Sinusoidal half-wave 50g / 11 ms |
| vibration resistance | - |
| ● acc. to IEC 60068-2-6 | 10 ... 500 Hz: 5g |
| reference code acc. to IEC 81346-2 | S |
| continuous current of the C characteristic MCB | 10 A; for a short-circuit current smaller than 400 A |
| continuous current of the quick DIAZED fuse link | 10 A |
| continuous current of the DIAZED fuse link gG | 10 A |
| operating voltage | - |
| ● at AC | - |
| — at 50 Hz rated value | 5 ... 500 V |
| — at 60 Hz rated value | 5 ... 500 V |
| ● at DC rated value | 5 ... 500 V |
| design of the interface for communication | without |
| design of the contact of auxiliary contacts | Silver alloy |
| number of NC contacts for auxiliary contacts | 2 |
| number of NO contacts for auxiliary contacts | 0 |
| type of electrical connection of modules and accessories | Screw-type terminal |
| type of electrical connection on enclosure | Cable routing above and below, both 1 x M20 |
| tightening torque of the screws in the bracket | 1 ... 1.2 N·m |
| tightening torque of fixing screws in the enclosure cover | 1.5 ... 1.7 N·m |
| tightening torque with screw-type terminals | 0.8 ... 0.9 N·m |
| ambient temperature | - |
| ● during operation | -25 ... +70 °C |
| ● during storage | -40 ... +80 °C |
| environmental category during operation acc. to IEC 60721 | 3M6, 3S2, 3B2, 3C3, 3K6 (with relative air humidity of 10 ... 95 %, no condensation in operation permitted for all devices behind front panel) |
| fastening method of modules and accessories | Floor mounting |
| shape of the installation opening | round |
| number of labels | 0 |
| number of inscription plates | 0 |
| last modified: | 10/1/2021 |
| Weight | 0.720 kg |
| Dimensions | 95.00 × 101.00 × 131.00 mm |
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