User Manual | S20T: Digital MCB (220V / 20A)

1. Introduction

Thank you for choosing the S20T. This high-precision device is designed to monitor, manage, and protect your 220V AC appliances. Featuring robust hardware controls and secure Bluetooth mobile connectivity, it offers real-time electrical monitoring and comprehensive fault protection.

2. Technical Specifications

  • Operating Voltage: 220V AC

  • Maximum Rated Current: 20A

  • Monitored Parameters: Voltage (V), Current (A), Frequency (Hz), Apparent Power (kVA), Active Power (kW)

  • Connectivity: Bluetooth (BLE)

  • Protection Mechanisms:

  • Low Voltage / High Voltage Cutoff (Configurable via App)

  • Over-Current Shutdown (Configurable via App up to 20A)

  • Short-Circuit Protection

  • Security: Password-protected configuration and control

3. Hardware Interface & Controls

  • Main Power Switch (Red Rocker Switch): Turning this switch ON energizes the controller logic. Turning it OFF completely cuts power to the controller.

  • Function Button (Blue Push Button): Multi-function tactile switch used for local interactions (e.g., manual load toggling).

  • Status LEDs (Red & Green): 

  • Red LED Solid: Load Disengaged.

  • Green LED Solid: Load Engaged.

  • Red & Green LEDs Blinking Simultaneously: Active Fault Condition (Load is automatically disengaged).

  • Red & Green LEDs Blinking Alternately: Device is in Password Generation Mode.

4. Mobile App Integration & Connectivity

Initial Setup & Pairing

If you already have the User Password, use this standard pairing procedure:

  1. Power On: Flip the Red Rocker Switch to the ON position.

  2. Enable Bluetooth: Ensure Bluetooth is enabled and the device is paired on your mobile.

  3. Open App Menu: Launch the companion app and open the main Menu.

  4. Register Device: Select the 'Add New Device' option.

  5. Authentication: Enter your unique Device ID and User Password, then Click OK to establish the secure connection.

Password Generation & Recovery (First-Time Setup / Reset)

If you need to generate a new User Password using your hardware Master Key, follow these steps:

  1. Enter Generation Mode: Turn the Red Rocker Switch OFF. Press and hold the Blue Push Button, then turn the Red Rocker Switch ON.

  2. Verify Mode: The Red and Green LEDs will start blinking in an alternate fashion. You may now release the button.

  3. App Registration: Open the 'Add New Device' dialog in the app. Enter your Device ID and your Master Key, then click OK.

  4. Password Sync: The controller will securely generate and sync the new User Password directly to the app.

  5. Multi-Device Access: The app will display the new User Password in a popup dialog. Save this password to connect additional mobile devices later without repeating this hardware process.

5. Key Features & Operation

Real-Time Monitoring

Once connected, the app dashboard displays live telemetry of your AC electrical mains:

  • Voltage (V) & Frequency (Hz): Ensures the incoming grid power is stable.

  • Current (A): Tracks the real-time electrical draw of the connected load.

  • Power Metrics: Differentiates between Active Power (kW) and Apparent Power (kVA) for precise energy tracking.

Smart Controls

  • Timer Function: Set specific on period to automate your appliance operations.

  • Advanced Scheduler Alarm: Set a time-triggered action to run on a Daily or One-Time basis using one of four distinct modes:

    • ON–OFF: Turn the load ON in the target duration, then turn load OFF after that set duration.

    • None–OFF: Do nothing in the target duration, then turn load OFF after that set duration.

    • ON–None: Turns the load ON in the target duration.

    • OFF–ON: Turn the load OFF in the target duration, then turn load to ON after a set duration.


6. Protection Systems & Troubleshooting

The controller constantly monitors the electrical environment. Settings can be enabled, disabled, or adjusted directly through the app configuration menu.

Fault Condition

Trigger Event

Action Taken

Recovery

Low / High Voltage

Grid voltage drops below or exceeds the set limits.

Instant load disengagement; Red and Green LEDs flash simultaneously.

Resumes automatically once grid voltage stabilizes within safe thresholds.

Over-Current

Connected appliances draw more current than the configured threshold (Max 20A).

Instant load disengagement  to prevent wiring damage; Red and Green LEDs flash simultaneously.

Clear the load obstruction/fault, then turn on via the App or by Blue Push Button.

Short Circuit

Sudden, extreme spike in current exceeding hardware handling.

Critical high-speed hardware shutdown; Red and Green LEDs flash simultaneously.

Inspect connected appliances for defects before turning on. Turn on via App or by Blue Push Button.

7. Wiring & Installation

Ensure power is completely cut at the main circuit breaker before starting the installation.

Wiring Configuration

  • Input Phase (Line In): Red Wire (2.5 mm2) — Connects to incoming 220V AC live grid.

  • Output Phase (Load): Yellow Wire (2.5 mm2)— Connects to the appliance live terminal.

  • Common Neutral: Thin White Wire — Connects to the system neutral line.


8. Safety Warnings

⚠️ IMPORTANT SAFETY INSTRUCTIONS

  • High Voltage Risk: This device operates on 220V AC power. Do not open the enclosure or handle exposed wiring while the mains are live.

  • Strict Capacity Limits: Do not connect loads exceeding 20A. Overloading the controller poses a significant fire hazard and risk of permanent hardware damage.

  • Wire Gauge Allocation: Ensure the 2.5 mm2 gauge wires are securely crimped or joined to support high-amperage current transmission safely.

  • Indoor Use Only: Keep the controller away from moisture, water, and extreme heat sources.

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