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#2 in Best Smart Circuit Breakers / Panels

Smart Circuit Breaker with Energy Monitoring, Adjustable Voltage and Current Protection (1-63 Amp),AC Disconnect Current…

Brand: MARSTEK

Best for

Best budget energy monitoring

Amazon rating

★★★★★4.8(40)

Amazon aggregate, one input among many in the Verdict Score

Verdict scoreFair
62/ 100

Based on 3 trusted sources

Current price

$16.99

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Updated May 18, 2026 · 1 min read

Smart Circuit Breaker with Energy Monitoring, Adjustable Voltage and Current Protection (1-63 Amp),AC Disconnect Current…

Sources behind this verdict

10 reviewers weighted by source trust

Methodology →

The consensus

What reviewers found

Synthesized across the trust-weighted source mix below.

Across the reviewers we read, this Tuya-style DIN-rail device occupies the cheapest tier of the 'smart breaker' market, and the consensus is more nuanced than its 4.8 Amazon rating suggests. r/electricians commenters note that devices in this class do measure usage and update frequently enough to be useful for circuit-level visibility, and r/homeautomation threads describe load-shedding and remote management as the features that justify the buy at this price. r/homeassistant users specifically call out that the Tuya integration is workable, especially via LocalTuya for users who want to avoid the cloud.

What reviewers liked

  • Very low price point (under $20) for app-controllable on/off plus voltage, current and energy monitoring
  • r/electricians and r/homeautomation threads confirm the energy data is frequent enough to be useful for load visibility
  • Tuya/Smart Life ecosystem with documented Home Assistant integration via LocalTuya per r/homeassistant
  • Adjustable overcurrent and over/undervoltage cutoffs broaden its use in DIY and solar setups

Where it falls short

  • High-trust r/homeassistant consensus is that this form factor is a smart relay, not a code-listed circuit breaker, and should not replace breakers in a U.S. service panel
  • Cloud setup typically required, r/homeassistant notes Tuya accounts are a sticking point
  • No UL listing referenced anywhere in the supplied signals
  • Long-term durability and firmware support unproven in the sources we read, with r/homeautomation specifically raising the 'WiFi obsolescence vs 30-year breaker lifespan' concern

Across the reviews

Synthesis · not our verdict

Across the reviewers we read, this Tuya-style DIN-rail device occupies the cheapest tier of the 'smart breaker' market, and the consensus is more nuanced than its 4.8 Amazon rating suggests. r/electricians commenters note that devices in this class do measure usage and update frequently enough to be useful for circuit-level visibility, and r/homeautomation threads describe load-shedding and remote management as the features that justify the buy at this price. r/homeassistant users specifically call out that the Tuya integration is workable, especially via LocalTuya for users who want to avoid the cloud.

The critical caveat, surfaced by multiple high-trust r/homeassistant threads, is blunt: these are not circuit breakers in the U.S. code sense. They are DIN-rail-mountable smart relays with adjustable overcurrent and over/undervoltage cutoffs, and the community warning is explicit that they should not be used to replace the actual breakers in a service panel. Reviewers across the threads we read suggest pairing them with a real breaker upstream, or using them in solar/DC and subpanel contexts.

For buyers who understand that distinction and want cheap, app-controlled per-circuit monitoring and remote cutoff, the price and feature set are competitive. For buyers expecting a code-listed panel-replacement breaker, the community consensus is that this is the wrong product.

Key specs

Source: Amazon listing
Tailored Protection
Customize overvoltage, undervoltage, and overcurrent values to suit your specific requirements.
Default Settings
Pre-set values for convenience - Overvoltage Trip at 140V, Undervoltage Trip at 90V, and Overcurrent Trip at 63A.
Intelligent Recovery
After power events, the circuit automatically restores itself within 30 seconds, ensuring continuous power supply.
User-Friendly Setup
Clear setting instructions conveniently provided on the product's side, making adjustments a breeze.
Comprehensive Guidance
Prior to use, consult the user manual for a complete understanding of fine-tuning protection settings.

What customers say

2 verified voices
Monitor each circuit at the panel, but cut power at each switch or plug. Use something similar to the Emporia Vie 3 for monitoring circuits, and ...
Trustedvia r/homeautomation
Do note, the IoTaWatt is for monitoring only (not turning on/off circuits), but it does an extremely good job of monitoring and can be ...
Trustedvia r/homeassistant

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