ATS
STQ2-4P CB-Class Automatic Transfer Switch
The TPKELE STQ2-4P is a heavy-duty CB-class (circuit breaker + mechanical interlock) four-pole automatic transfer switch with a rotary handle for clear position indication and manual override. A built-in motor transfers a 4P (3 lines + neutral) load between normal (mains) and emergency supply in about 2 seconds, with mechanical interlock plus over-voltage and under-voltage protection. Rated 63A at 110V / 220V AC, up to ~13.9kW, compatible with three-phase and single-phase loads — built for hospitals, cold storage and data centers.
Key Features
- CB class — circuit breaker + mechanical interlock
- Rotary handle with clear Normal / Emergency indication
- Motorized auto transfer, ~2s changeover
- 4P (3 lines + neutral), 3-phase & single-phase compatible
- Mechanical interlock + over/under-voltage protection
Need full datasheet, drawing or certificates for tender?
Typical Applications
Technical Specifications
| Product Model | STQ2-4P |
|---|---|
| Product Type | CB-Class Automatic Transfer Switch (Rotary Handle) |
| Utilization Class | CB Class (Circuit Breaker + Mechanical Interlock) |
| Poles | 4P (3 Lines + Neutral) |
| Rated Current | 63A (Working Range: 6A – 63A) |
| Rated Voltage | 110V / 220V AC |
| Frequency | 50 / 60 Hz |
| Phase | Three-Phase with Neutral (compatible with 3-phase & single-phase loads) |
| I/O Configuration | 2 Inputs / 1 Output |
| Priority Source | Normal Power (N / Mains) |
| Compatible Sources | Mains, Generator, PV Inverter |
| Switching Mode | Auto & Manual |
| Auto Transfer Time | ~2s |
| Power Interruption | Brief ~2s during transfer |
| Protection | Mechanical Interlock, Over-voltage & Under-voltage |
| Max Load Power | ~13.9kW (13870W) |
| Internal Components | PCB Control Board, Motor, Thermal Relay |
| Installation | 35mm DIN Rail |
| Certification | CE, RoHS |
Certifications & Standards
Verified to international standards for global tenders
OEM / ODM Available
Private label this ATS for your brand
Logo, color housing, packaging and certificate documentation tailored to distributor and brand-owner programs.
- Custom logo printing on housing and packaging
- Color housing variants for product line differentiation
- Private-label catalogs and datasheet customization
- Project-spec drawings, single-line diagrams and labels
- Container-load supply with export documentation
- Sample preparation within 5–10 working days
Frequently Asked Questions
What is the difference between the PC-class and CB-class series?
ATS-ST and ATS-W2R are PC-class (load-level) switches with very fast ~50ms changeover, ideal where short transfer time matters. STQ1 and STQ2 are CB-class motorized switches with mechanical interlock and a robust ~2s transfer, preferred for fire protection, elevators and heavy industrial backup.
What current ratings and poles are available?
All four series are rated 63A (operating range 6A–63A) and offered in 2P, 3P and 4P (ATS-ST is 2P / 4P). Contact us with your line current and phase configuration and we will confirm the right model.
Can the ATS work with diesel generators?
Yes — all series are designed for mains plus generator, inverter or backup setups. They transfer loads automatically when the primary source fails and return when mains is restored.
Do you support OEM branding for ATS?
Yes — logo, label and packaging customization are available for distributor and brand-owner programs.
