Shelly Pro 4CB C32 smart circuit breaker, 3P+N, 32 A
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Choose countryThe Shelly Pro 4CB C32 is a smart miniature circuit breaker for appropriately selected three-phase circuits. Its 3P+N design disconnects three phase conductors and the neutral together, with a 32 A rated current, C tripping characteristic and 6 kA short-circuit breaking capacity.
Protection and remote control
A thermal-magnetic mechanism disconnects the circuit during an overload or short circuit. Electronic overvoltage and undervoltage protection offers configurable thresholds and response delays. Use Shelly Smart Control to check status, change settings and disconnect the circuit remotely.
Remote re-energisation is available only after a previous remote disconnection and when the appropriate conditions are met. It is not available after a protection trip or manual switch-off. A physical safety switch disables electronic control, including remote switching. Remote switching frequency must be less than once per minute.
Monitoring and automation
- Measurements: AC voltage monitoring with ±5% accuracy and internal device temperature measurement.
- Events: switching and protection event history, configurable notifications and data export to CSV or through JSON/RPC.
- Connectivity: 2.4 GHz Wi-Fi, Bluetooth 4.2, Ethernet and a built-in web interface. Basic local-network control needs no additional control panel.
- Automation: schedules, scripts, webhooks and integration using MQTT, HTTP and WebSocket.
Installation and indicators
The device mounts on a DIN rail in an electrical panel. It has a manual lever, reset button and communication LEDs. The mechanical indicator is red when the circuit is energised and green when de-energised. Dimensions are 93 × 90 × 76 mm, with an operating temperature range of -5 to 40 °C.
| Model | Pro 4CB C32 |
|---|---|
| Type | Smart miniature circuit breaker (MCB) |
| Number of poles | 4 |
| Pole configuration | 3P+N |
| Rated current | 32 A |
| Tripping characteristic | C |
| Short-circuit breaking capacity | 6 kA |
| Electronics supply voltage | 230 V AC, 50 Hz |
| Minimum operating voltage | 160 V AC, 50 Hz |
| Electronics power consumption | Less than 3 W |
| Power loss | 8.40 W |
| Insulation voltage | 500 V |
| Rated impulse withstand voltage | 4 kV |
| Energy-limiting class | 3 |
| Standard | IEC 60898-1 |
| Electrical endurance | Over 6 000 cycles |
| Mechanical endurance | Over 10 000 cycles |
| Remote switching frequency | Less than once per minute |
| Protections | Overload, short circuit, overvoltage, undervoltage |
| Voltage measurement | Yes, accuracy ±5% |
| Internal temperature measurement | Yes |
| Wireless connectivity | Wi-Fi, Bluetooth |
| Wi-Fi standard | IEEE 802.11 b/g/n |
| Wi-Fi frequency | 2 412–2 483 MHz |
| Maximum Wi-Fi transmit power | Less than 20 dBm |
| Wi-Fi range | Up to 30 m indoors, up to 50 m outdoors |
| Bluetooth version | 4.2 |
| Bluetooth frequency | 2402–2480 MHz |
| Maximum Bluetooth transmit power | Less than 4 dBm |
| Bluetooth range | Up to 10 m indoors, up to 30 m outdoors |
| Wired connectivity | Ethernet RJ45 |
| Supported protocols | MQTT, HTTP, WebSocket |
| App | Shelly Smart Control |
| Additional features | Schedules, scripts, webhooks, BLE Gateway, Wi-Fi Range Extender, virtual components, KVS, OTA updates |
| Inputs | 1/L, 3, 5, 7/N |
| Outputs | 2, 4, 6, 8 |
| Maximum terminal tightening torque | 2.5 Nm |
| Maximum single-strand wire cross-section | 6 mm² |
| Maximum multi-strand wire cross-section | 25 mm² |
| Maximum flexible cable cross-sectional area | 16 mm² |
| Cable stripping length | 15 mm |
| Mounting | DIN rail |
| Housing material | Plastic |
| Colour | Light grey (RAL 7035) |
| Dimensions | 93 × 90 × 76 mm |
| Weight | 575 g |
| Operating temperature | -5 °C to 40 °C |
| Relative humidity | 30–70% RH |
| Maximum operating altitude | 2 000 m above sea level |
| Environmental pollution degree | 2 |
| EAN | 3800238074135 |
|---|
Can the circuit be remotely re-energised after a protection trip?
No. Remote re-energisation is unavailable after a protection trip or manual switch-off. It is possible after a previous remote disconnection, provided the appropriate conditions are met.
Is an additional control panel needed for local control?
No additional control panel is required for basic control within a local network. The device provides a built-in web interface, Wi-Fi and Ethernet connectivity.
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