Harmony XB4
Schneider Electric catalog image for this SKU; may represent the product family.
PUSH-BUTTON
Harmony XB4, Push button, metal, black mushroom Ø40, Ø22, spring return, unmarked, 1 NO
SKU XB4BC21Schneider Electric XB4BC21 is a push-button in the Harmony XB4 range. Key specifications include ip protection: IP66 conforming to IEC 60529; net weight: 0.122 kg; product range: Harmony XB4.
IP66 conforming to IEC 60529IP protection
0.122 kgNet weight
Harmony XB4Product range
PRODUCT DATA
Technical specifications
Source: Schneider Electric product catalog.
Verified September 18, 2026.
| Product reference | XB4BC21 |
|---|---|
| Range of product | Harmony XB4 |
| Device short name | XB4 |
| Product or component type | Push-button |
| Bezel material | Chromium plated metal |
| Fixing collar material | Zamak |
| Mounting diameter | 22.5 mm |
| Sale per indivisible quantity | 1 |
| Shape of signaling unit head | Round |
| Type of operator | spring return |
| Operator profile | Black mushroom Ø 40 mm, unmarked |
| Head type | Standard |
| Contacts type and composition | 1 NO |
| Contact operation | Slow-break |
| Connections - terminals | Screw clamp terminals, <= 2 x 1.5 mm² with cable end conforming to IEC 60947-1 Screw clamp terminals, 1 x 0.22...2 x 2.5 mm² without cable end conforming to IEC 60947-1 |
| Height | 46.5 mm |
| Width | 40 mm |
| Depth | 81.5 mm |
| Net weight | 0.122 kg |
| Resistance to high pressure washer | 7000000 Pa at 55 °C, distance : 0.1 m |
| Contacts usage | Standard contacts |
| Positive opening | Without |
| Operating travel | 2.6 mm (NO changing electrical state) 4.3 mm (total travel) |
| Operating force | 3.8 N NO changing electrical state |
| Mechanical durability | 5000000 cycles |
| Tightening torque | 0.8…1.2 N.m conforming to IEC 60947-1 |
| Shape of screw head | Cross compatible with Philips no 1 screwdriver Cross compatible with pozidriv No 1 screwdriver Slotted compatible with flat Ø 4 mm screwdriver Slotted compatible with flat Ø 5.5 mm screwdriver |
| Contacts material | Silver alloy (Ag/Ni) |
| Short-circuit protection | 10 A cartridge fuse type gG conforming to IEC 60947-5-1 |
| [Ith] conventional free air thermal current | 10 A conforming to IEC 60947-5-1 |
| [Ui] rated insulation voltage | 600 V (pollution degree 3) conforming to IEC 60947-1 |
| [Uimp] rated impulse withstand voltage | 6 kV conforming to IEC 60947-1 |
| [Ie] rated operational current | 3 A at 240 V, AC-15, A600 conforming to IEC 60947-5-1 6 A at 120 V, AC-15, A600 conforming to IEC 60947-5-1 0.1 A at 600 V, DC-13, Q600 conforming to IEC 60947-5-1 0.27 A at 250 V, DC-13, Q600 conforming to IEC 60947-5-1 0.55 A at 125 V, DC-13, Q600 conforming to IEC 60947-5-1 1.2 A at 600 V, AC-15, A600 conforming to IEC 60947-5-1 |
| Electrical durability | 1000000 cycles, AC-15, 2 A at 230 V, operating rate <3600 cyc/h, load factor: 0.5 conforming to IEC 60947-5-1 appendix C 1000000 cycles, AC-15, 3 A at 120 V, operating rate <3600 cyc/h, load factor: 0.5 conforming to IEC 60947-5-1 appendix C 1000000 cycles, AC-15, 4 A at 24 V, operating rate <3600 cyc/h, load factor: 0.5 conforming to IEC 60947-5-1 appendix C 1000000 cycles, DC-13, 0.2 A at 110 V, operating rate <3600 cyc/h, load factor: 0.5 conforming to IEC 60947-5-1 appendix C 1000000 cycles, DC-13, 0.5 A at 24 V, operating rate <3600 cyc/h, load factor: 0.5 conforming to IEC 60947-5-1 appendix C |
| Electrical reliability | Λ < 10exp(-6) at 5 V and 1 mA in clean environment conforming to IEC 60947-5-4 Λ < 10exp(-8) at 17 V and 5 mA in clean environment conforming to IEC 60947-5-4 |
| Device presentation | Complete product |
| Protective treatment | TH |
| Ambient air temperature for storage | -40…70 °C |
| Ambient air temperature for operation | -40…70 °C |
| Overvoltage category | Class I conforming to IEC 60536 |
| IP degree of protection | IP66 conforming to IEC 60529 IP69 IP69K |
| Enclosure Type | UL type 4X/13 |
| IK degree of protection | IK06 conforming to IEC 50102 |
| Standards | IEC 60947-5-1 CSA C22.2 No 14 IEC 60947-1 IEC 60947-5-5 UL 508 JIS C8201-5-1 IEC 60947-5-4 JIS C8201-1 |
| Product certifications | CSA LROS (Lloyds register of shipping) BV UL listed DNV |
| Vibration resistance | 5 gn (f= 2…500 Hz) conforming to IEC 60068-2-6 |
| Shock resistance | 10 gn (duration = 11 ms) for half sine wave acceleration conforming to IEC 60068-2-27 |
For complete electrical ratings, applicable standards, connection requirements and installation instructions, consult the official Schneider Electric reference ↗.