1. Product Overview
The TOMZN TOB1S-63 4P is a Wi-Fi smart circuit breaker designed for comprehensive electrical safety and smart energy management. It integrates over/under-voltage, over-current, overload, short-circuit, and over-temperature protection. This device provides real-time monitoring of voltage, current, power, and energy consumption, offering features like prepaid billing and a manual lock for enhanced safety. It can be remotely controlled and monitored via Wi-Fi, making it an efficient solution for smart home and industrial applications.
Key Features:
- Comprehensive Protection: Includes over-voltage, under-voltage, over-current, overload, short-circuit, and high-temperature protection.
- Energy Monitoring: Real-time measurement of Voltage (V), Amperage (A), Active Power (kW), Active Energy (kWh), and Temperature (°C).
- Smart Control: Wi-Fi remote control via the SmartLife app, timer functions, and prepaid billing capability.
- RS485 Communication: Allows for remote control (ON/OFF) and data export via RS485.
- Simultaneous Disconnection: Cuts off both the neutral (N) and live (L) lines simultaneously to eliminate standby power risks.
- Mechanical Lock: Ensures safety during maintenance by preventing accidental closure.

Figure 1: TOMZN TOB1S-63 4P Smart Circuit Breaker highlighting key features like WiFi+RS485, Timer, Prepaid function, and various protections.
2. Safety Information
General Warnings:
- Suffocation Hazard: Keep packaging bags away from babies and children. Do not use in cribs, beds, carriages, or playpens. This bag is not a toy.
- Professional Installation: After receiving the product, ensure an electrical professional performs the installation and initial operation.
Precautions:
- Do not place the device near flammable materials.
- Ensure adequate ventilation during operation to prevent overheating.
- Disconnect the device from power and store it properly when not in use for extended periods.
- Always engage the mechanical lock during maintenance to prevent accidental power restoration.
3. Specifications
| Feature | Specification |
|---|---|
| Brand Name | TOMZN |
| Model Number | TOB1S-63 4P |
| Type | Mini Circuit Breaker |
| Smart Device | Yes |
| Rated Voltage | L+N 220-230V AC, 50/60Hz |
| Rated Current | 63A (Adjustable range: 1-63A) |
| Over Voltage Protection | Adjustable range: 250-300V (Default: 275V) |
| Under Voltage Protection | Adjustable range: 150-200V (Default: OFF) |
| Overload Alarms | Adjustable range: 1-13kW (Default: 13kW) |
| High Temperature Alarm | Adjustable range: 40-150℃ (Default: 80℃) |
| Insufficient Balance Warning | Adjustable range: 1-65535kWh (Default: 10kWh) |
| Measurement Error | Current, Voltage: ≤5% |
| Installation | 35mm DIN Rail |
| Certification | CE |
| Leakage Protection | Note: This product does NOT have a leakage protection function. |
Dimensions:
- Width: 89mm (front), 77mm (side max)
- Height: 100mm (total), 110mm (with antenna)
- Depth: 63mm (front to back), 35mm (antenna height)

Figure 2: Dimensional drawing of the TOB1S-63 4P Smart Circuit Breaker.
Applicable Regulations and Harmonized Standards:
- Low Voltage Directive 2014/35/EU
- Electromagnetic Compatibility Directive 2014/30/EU
- Restriction of the Use of Certain Hazardous Substances (RoHS) Directive 2011/65/EU
4. Setup and Installation
4.1. Wiring Instructions:
- Ensure power is OFF before starting any wiring.
- Connect the equipment in accordance with the provided wiring diagram specifications.
- For DIY wiring, input the Live (L) and Neutral (N) lines, then screw down to penetrate the insulating layer of the power lines.
- After wiring, adjust the equipment parameters as needed.

Figure 3: Wiring diagram showing L1, L2, L3, N inputs and outputs, and RS485 A/B connections.
4.2. SmartLife Software Instruction (App Setup):
- Before starting the connection, ensure your phone's Wi-Fi and Bluetooth are turned ON.
- Connect your phone to a 2.4GHz Wi-Fi network (5GHz networks are not supported).
- On the circuit breaker, press and hold the network button until the Wi-Fi indicator light flashes rapidly, indicating the device is in network matching (pairing) mode.
- Open the SmartLife app on your smartphone.
- Tap the "+" icon (usually in the top right corner) to add a device.
- The app should automatically discover the