Automatic Transfer Switch SINOTIMER SMQ5-125 / 4P 125A

Technical Specifications:

• Brand: SINOTIMER
• Model: SMQ5-125 / 4P
• Type: Automatic Transfer Switch (ATS) three-phase
• Nominal Current: 125A
• Number of Poles: 4P (L1 + L2 + L3 + N)
• Rated Voltage: 400V AC
• Frequency: 50/60Hz
• Operating Modes: Automatic / Manual
• Support: Panel or metal plate
• Certifications: CE

General Description:

The SINOTIMER SMQ5-125 / 4P is a high-power three-phase automatic transfer switch designed for safe switching between two three-phase power sources, such as the electrical grid and a generator or three-phase inverter. The device ensures a stable power supply to consumers, automatically switching to backup source in case of main source failure, and automatically returning after voltage restoration.

Operating Principle:

In automatic mode, the switch monitors the presence of voltage on the normal source. If voltage is lost in one or more phases, the load is automatically transferred to the backup source. Once voltage is restored on all phases of the main source, the device automatically switches back.

Front Panel Elements and Controls:

• Automatic / Manual selector switch
• Rotary lever for immediate mechanical switching
• LED indicators for presence of voltage on the normal source
• LED indicators for presence of voltage on the backup source
• Clear markings for Normal Power (N) and Emergency Power (E)
• Direction arrows indicating switching direction

Electrical Connections:

Normal Power Input:

• Phase L1
• Phase L2
• Phase L3
• Neutral N

Emergency Power Input:

• Phase L1
• Phase L2
• Phase L3
• Neutral N

Electrical Characteristics:

• Maximum rated current: 125A
• Operating Voltage: 400V AC
• Frequency: 50/60Hz
• Four-pole switching L1 + L2 + L3 + N
• Automatic and mechanical operation
• High switching capacity for large three-phase loads

Installation:

• Support on panel or metal plate
• Secured with screws via housing holes
• Recommended for installation in enclosed electrical panels
• Installation must be performed by qualified personnel

Application Areas:

• Three-phase installations with backup generator
• Three-phase photovoltaic systems
• Commercial and industrial buildings
• Workshops, technical rooms, halls
• Applications where continuous three-phase power is critical

Important Notes:

• Does not provide short-circuit protection
• Does not replace circuit breakers or fuses
• Use with proper upstream protection is recommended
• Does not allow simultaneous operation of both power sources