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
Amazon aggregate, one input among many in the Verdict Score
Based on 3 trusted sources
Current price
$16.99
Updated May 18, 2026 · 1 min read

Sources behind this verdict
10 reviewers weighted by source trust
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 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.
- 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.
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