Smart WIFI DC Circuit Breakers, Relays & Modules

Why a DC circuit needs its own smart breaker

DC current does not zero-cross the way AC does, so a standard AC MCB can arc and weld shut when interrupting a fault on a solar or battery line. A DC-rated smart breaker is built with a magnetic blow-out chamber that safely breaks DC arcs up to its rated voltage (typically 250V DC or 1000V DC for solar strings). Using the right device on your PV array, battery bank or inverter input is not optional — it is the difference between a clean trip and a fire on the roof.

The smart layer adds remote ON/OFF, schedules, energy monitoring, voltage protection and Tuya / Smart Life app alerts on top of the safety function.

Who buys smart DC breakers and relays in Pakistan

• Solar households (3kW–15kW rooftop systems) — protect PV strings and battery banks; remotely cut off solar input from your phone during maintenance.
• Net-metering customers — pair with our smart bi-direction reverse meter to monitor solar export.
• Off-grid / hybrid inverter users — switch DC loads (lights, fans, pumps) on a schedule to stretch battery life.
• Shops and warehouses on UPS/inverter backup — remote-cut DC feeds without going to the meter room.
• Solar pump and tube-well operators — schedule DC pump runtime; cut power instantly via Tuya if water tank overflows.
• EV / e-bike / golf-cart charging stations — timed DC supply, energy logging, theft control.
• System integrators and electricians — DIN-rail mountable, drop-in replacement for dumb DC isolators.

What’s inside this category

Smart DC Circuit Breakers

DC-rated MCBs with WiFi control, energy metering, over-voltage / under-voltage / over-current protection. Ratings from 16A to 125A, single-pole and double-pole, 250V DC and 1000V DC for solar strings. Compatible with Tuya, Smart Life and eWeLink apps.

WiFi DC Relays & Timer Modules

Compact DIN-rail or in-line DC relay modules (12V / 24V / 48V coils) with WiFi or Zigbee. Set timers, countdown schedules and voice-control DC loads through Alexa or Google Home. See our flagship smart DC relay timer switch — the most-ordered module in this range.

DC Smart Switches & Modules

Behind-the-switch DC modules for retrofitting any 12V/24V DC switch into a smart switch — perfect for solar-powered rooms, RVs, boats, cabins and off-grid huts. Browse the related smart switch modules for AC equivalents.

DC Energy Meters & Bi-Direction Solar Meters

Measure DC voltage, current, kWh and power factor on the solar / battery side. Pair with the smart breaker with built-in energy monitoring for a complete generation + consumption picture in one Tuya dashboard.

Key specifications to look for

Real-world use cases in Pakistan

• Karachi rooftop solar (5kW): Cut DC string from phone before cleaning panels — no more turning the manual isolator in the sun.
• Lahore office back-up (10kVA inverter + lithium): Schedule DC loads to switch off automatically at 11 PM, save 18-22% battery cycle wear.
• Faisalabad farm tube-well: Solar DC pump set to run 8 AM–5 PM only; overflow sensor cuts pump via Tuya scene.
• Islamabad EV charger: DC supply turns on only when your car is home; energy meter logs every charge for billing.
• Quetta off-grid cabin: 24V DC LED lighting on schedule + voice control via Alexa.

How to choose the right smart DC breaker

1. Identify your DC voltage. Check your inverter / solar string spec — most residential systems are 150V–500V DC; commercial 600V–1000V DC.
2. Match the current rating. Add a 25% safety margin over your peak load (e.g. 50A continuous → 63A breaker).
3. Pick the pole count. Use 2P for solar and battery lines; 1P only for low-voltage 12V/24V LED or signal lines.
4. Confirm app compatibility. If you already use Tuya / Smart Life for your smart switches or WiFi CCTV cameras, stay on Tuya for one-app control.
5. Need bi-direction metering? Choose a unit with reverse-current support to track solar export.

Installation & setup

All units in this category are 35mm DIN-rail mountable and ship with QR-code-based pairing for the Tuya / Smart Life app. WiFi is 2.4 GHz only — most Pakistani routers (PTCL, Stormfiber, Nayatel) broadcast both 2.4 GHz and 5 GHz; just connect your phone to the 2.4 GHz SSID during initial pairing. DC wiring must follow polarity — wrong polarity will not damage the breaker but it will not protect the circuit. We recommend installation by a licensed electrician for any system above 48V DC. Free technical support and site survey in Karachi, Lahore and Islamabad.

Brands & ecosystem

We stock Tomzn — Pakistan’s most-searched smart breaker brand — alongside Tuya-certified OEM modules and Omni Smart branded relays. All products integrate with the standard Tuya / Smart Life ecosystem, work with Alexa and Google Home, and pair with our Zigbee hubs for mesh setups.

Frequently asked questions

Can I use an AC WiFi breaker on my solar DC line?

No. AC breakers depend on the AC waveform’s zero-crossing to interrupt the arc. On DC the arc will sustain, weld the contacts and create a fire hazard. Always use a DC-rated breaker on solar strings, battery banks and DC loads.

Will a smart DC breaker work with my 5kW hybrid inverter?

Yes — as long as the breaker’s DC voltage rating exceeds your maximum string voltage (Voc × number of panels in series) and the current rating exceeds your inverter’s max DC input current. For most 5kW hybrid systems in Pakistan, a 2-pole 63A 500V DC breaker is the right fit.

Does it work on 2.4 GHz WiFi only?

Yes. All smart DC breakers and relays in this category connect on 2.4 GHz WiFi. If your router is dual-band, temporarily connect your phone to the 2.4 GHz SSID during pairing — after that, the breaker stays connected on its own.

Can I monitor solar generation from this breaker?

Models with built-in energy monitoring report kWh, voltage, current and power factor in real time inside the Tuya / Smart Life app. For full bi-directional net-metering tracking, pair it with our bi-direction smart reverse meter.

Is installation included?

DIY-friendly for licensed electricians. For Karachi, Lahore and Islamabad, we offer a paid on-site installation service. Request a quote for full system commissioning.

What’s the warranty?

12-month replacement warranty on all Tomzn and Omni Smart branded DC breakers and relays against manufacturing defects. Damage from incorrect polarity, surge events or over-current beyond rated capacity is excluded.

Related categories

• WiFi Smart Breakers (AC side) — the grid-side companion to this category.
• Smart Switch Modules — retrofit any existing switch into a smart switch.
• Tomzn Smart Devices — our top-selling smart breaker brand.
• Smart WiFi Switches & Sockets — pair with your DC setup for full home automation.
• Zigbee Devices & Hubs — for mesh-network deployments.