How does the MOREDAY ATS Automatic Transfer Switch work?

The ATS automatically transfers the power source between Source 1 (Grid) and Source 2 (Generator/Solar Backup), detecting undervoltage, phase loss, or blackout and switching within 200ms. Ideal for homes with generator backup and uninterruptible-power systems.

Which MOREDAY ATS model is right for my system?

MDQR5 series — MDQR5-100-2P-63A for single-phase 63A homes, MDQR5-100-4P-63A for three-phase 63A, MDQR5-100-2P/4P-100A for businesses at 100A. Switching time ≤200ms, IEC 60947-6-1 certified.

Where can I buy MOREDAY in Thailand?

QES Energy is the authorized distributor of MOREDAY Electric in Thailand, supplying ATS MDQR5, RCCB Type-B EKL6, AC/DC MCB and MCCB — 100% genuine with a 1-year warranty. Contact Line @qesenergy.

How does RCCB Type-B differ from Type-A?

Type-A detects AC and small pulsating DC. Type-B additionally detects the smooth DC residual emitted by solar inverters. IEC 62423 requires Type-B for systems containing inverters.

What is the difference between ATS and a Manual Transfer Switch (MTS)?

MTS (Manual) requires a person to flip the switch. ATS (Automatic) transfers within 200ms so refrigerators keep food cold, computers stay on and servers keep running. MOREDAY EKL6 is a true automatic ATS.

Which MOREDAY model should I use for a battery storage system?

It depends on battery voltage (P=VI). LV Battery 48-96V high-current (QES Battery, Pylontech, BYD HV-S, Dyness): use MDM6Z-250 or MDM6Z-320 MCCB 250-320A. HV Battery 200-500V lower-current (BYD HVM/HVS, GoodWe Lynx Home F, Pylontech Force H): use MDM6Z-100 or MDM6Z-160 MCCB 100-160A. Note: MDB1Z/MDB2Z-63 DC MCBs are for PV strings, not batteries.

// AUTHORIZED DISTRIBUTOR IN THAILAND

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Name: MOREDAY ATS Automatic Transfer Switch + RCCB Type-B + MCB
Brand: MOREDAY Electric
Availability: InStock
Rating: 4.8 (48 reviews)

MOREDAY Automatic Transfer Switch (ATS) — auto-switches power source between Grid ↔ Generator/Solar Backup in under 200ms · also covers RCCB Type-B · MCB · MCCB for complete solar system protection

SWITCH: ≤200ms SOURCES: 2 (Grid + Backup) POLES: 2P / 3P / 4P CURRENT: 63 – 320A

How ATS Works Request Quote

// MOREDAY ATS MDQR5-100 · LIVE STATUS

AUTO MODE

Source 1 · Grid

230.4 V

// ✓ Active · Normal

Source 2 · Backup

228.7 V

// ◌ Standby · Ready

Load Current

24.7 A

// rated: 63A · 39%

Switching Time

180 ms

// limit: 200ms

// Source 1 voltage trace · last 10s

ATS STATUS SOURCE 1 ACTIVE · NO TRANSFER

// AUTOMATIC TRANSFER SWITCH

When the grid fails — it switches itself in under 200ms

MOREDAY ATS detects grid failure and switches to Generator / Solar backup automatically — power is restored before your computer even reboots.

// 01

Grid Active

ATS monitors voltage from Source 1 (Grid) in real-time while the Generator stays on standby.

SRC 1 · 230V ✓

// 02

Grid Failure

Instantly detects undervoltage / overvoltage / phase loss / total blackout on Source 1.

DETECTED · 50ms

// 03

Auto Transfer

Disconnects Source 1 → starts the Generator → connects Source 2 within 200ms · load keeps running uninterrupted.

SRC 2 · 228V ✓

// PLUS: RCCB SPECIALTY

The RCCB Type-B your solar system needs

Solar inverters emit smooth DC residual current that ordinary RCCBs (Type-A) cannot detect → only Type-B can handle it.

// TYPE-A · STANDARD

RCCB Type-A

The breaker used in ordinary homes — not suitable for solar

Detects AC residual current
Detects small pulsating DC
Does NOT detect smooth DC residual
Risky in systems with an inverter

// Not recommended for Solar PV

// TYPE-B · SOLAR

MOREDAY RCCB Type-B

A breaker specialized for solar — covers every residual current type

Detects AC residual current
Detects pulsating DC
Detects smooth DC residual
IEC 62423 compliant · suited for Solar PV

// MDQR5-100 · MDQ2-63 · EKL6-100B

// DC BATTERY PROTECTION

Breakers for battery systems

Battery storage requires DC-rated breakers only — DC is harder to interrupt than AC (no zero-crossing). MOREDAY breakers are engineered specifically for Li-ion / LiFePO4 / Lead-acid batteries.

// LOW VOLTAGE · HIGH AMP

LV Battery 48V / 72V / 96V

For residential batteries — QES Battery, Pylontech US/RT, BYD HV-S, Dyness Powerbox · low voltage → requires high current

Recommended ModelMDM6Z-250 / MDM6Z-320

Voltageup to 250VDC

Current250A / 320A

Poles2P / 4P (MCCB)

Breaking35kA · Adjustable

// HIGH VOLTAGE · MID AMP

HV Battery 200V – 500V

For commercial / utility batteries — BYD HVM/HVS, GoodWe Lynx Home F, Pylontech Force H · high voltage → lower current required

Recommended ModelMDM6Z-100 / MDM6Z-160

Voltageup to 500VDC

Current100A / 160A

Poles2P / 4P (MCCB)

Breaking35kA · Adjustable

// 01

DC has no zero-cross

AC breakers extinguish the arc at the zero-cross (100 times/second) · DC flows continuously — you need a breaker that can extinguish the arc on its own.

// 02

Inrush during charging

Batteries draw high current at the start of charging — you need Curve C that tolerates inrush without nuisance tripping.

// 03

Polarity-sensitive

Batteries have +/− that cannot be reversed — MOREDAY DC MCBs are engineered to break the correct polarity and remain safe under fault.

// FAQ

Frequently Asked Questions

The ATS is a switch that automatically transfers the power source between Source 1 (Grid) and Source 2 (Generator / Solar Backup) — it detects undervoltage / phase loss / blackout and switches over within 200ms. Ideal for homes with a generator backup, shops, or any system that needs uninterruptible power.

MOREDAY MDQR5 series — MDQR5-100-2P-63A for single-phase homes at 63A (≈14kW) · MDQR5-100-4P-63A for three-phase homes at 63A (≈22kW) · MDQR5-100-2P/4P-100A for businesses/factories at 100A (≈69kW) · all models switch in ≤200ms and are IEC 60947-6-1 certified.

QES Energy is the authorized distributor of MOREDAY Electric in Thailand, carrying the full range — ATS (MDQR5), RCCB Type-B (EKL6), AC/DC MCB and MCCB — 100% genuine with a 1-year warranty. Contact us on Line @qesenergy.

Type-A: only detects AC and small pulsating DC · Type-B: additionally detects the smooth DC residual current emitted by solar inverters — using Type-A with solar can leave the breaker "blind" to real DC faults, creating a risk of electric shock or fire. IEC 62423 requires Type-B for systems that include inverters.

MTS (Manual): someone has to physically flip the switch — cheap, but if the grid fails at night or no one is home you simply wait · ATS (Automatic): switches over instantly within 200ms — food in the fridge stays cold, computers do not shut down, servers keep running · MOREDAY EKL6 is a true automatic ATS that needs no manual operation.

It depends on battery voltage (P = V×I — lower voltage means higher current) — LV Battery 48–96V (QES Battery, Pylontech US/RT, BYD HV-S, Dyness): use MDM6Z-250 / MDM6Z-320 MCCB 250–320A (high current) · HV Battery 200–500V (BYD HVM/HVS, GoodWe Lynx Home F, Pylontech Force H): use MDM6Z-100 / MDM6Z-160 MCCB 100–160A (high voltage, lower current) · Note: MDB1Z/MDB2Z-63 DC MCBs are designed for PV strings only — not for batteries.

Power never.
stops.