2P Changeover Switch

Ensure safe and reliable power source switching with the CDADA SF Series 2P Changeover Switch, it is suitable for critical circuit conversion in residential, commercial, and light industrial applications. This DIN-rail mounted micro changeover switch supports dual power sources or loads with a clear 3-position operation: I -OFF-II, enabling seamless transitions between mains/grid and backup/generator supplies, motor forward/reverse control, or phase/voltage monitoring circuits.

Rated for AC 50/60Hz, 230–400V, and currents from 16A to 125A, the CDADA 2P changeover switch complies with IEC 60947-3 and EN 60947-3 standards. Featuring ON/OFF position indicators, high-conductivity contacts, and a spring-assisted quick-make/break mechanism, it ensures stable performance even under frequent manual operation. Designed for modular installation alongside MCBs and contactors, it’s ideal for distribution boards in buildings, pump rooms, telecom cabinets, and emergency lighting systems.

Key Specifications

Series: SF Series 2P Manual Changeover Switch

Brand: CDADA | Manufacturer: Shanghai DADA Electric CO.,LTD

Poles: 2P (Dual Pole) — available in 1P to 4P variants

Rated Current: 16A – 125A (derate to 80% above 40°C ambient)

Rated Voltage: 230/400V AC, 50/60Hz

Insulation Voltage (Ui): 500V

Utilization Category: AC-22A (mixed resistive & inductive loads)

Short-Time Withstand Current (Icw): 12×Ie for 1s

Making Capacity: 20×Ie, t=0.1s

Mechanical Life: 8,500 operations

Electrical Life: 1,500 operations (under load)

Pollution Degree: II

Mounting: Standard TH35 DIN rail

Operation: Manual 3-position handle (I – O – II)

Indicators: Visible ON/OFF position via handle alignment

Terminals: Cable or busbar connection

Tightening Torque:

1.2 N·m (16–40A)

3.5 N·m (63–125A)

Safety Note: No arc extinguishing chamber → must be used with upstream fuses/MCBs for short-circuit protection

Technical data sheet

Why Choose CDADA 2P Changeover Switch?

★ Safe 3-Position Isolation 

True OFF (O) position disconnects both sources—critical for maintenance and anti-backfeed safety.

★ DIN-Rail Modular Design 

Installs in seconds alongside MCBs—saves space and simplifies panel layout in smart buildings or OEM enclosures.

★ High Reliability Contacts 

Optimized dynamic-static contact geometry ensures low resistance and long-term stability.

★ Global Compliance 

Certified to IEC 60947-3 accepted in Europe, Asia, Africa, and Latin America.

★ User-Safe Operation 

Spring-assisted mechanism prevents partial engagement; extended handle optional for 63A+ models.

★ Versatile Applications 

From generator transfer to motor direction reversal—one switch, multiple functions.

Typical Applications

Backup Power Systems: Switch between utility and generator

Motor Control: Forward/reverse rotation of small pumps or fans

Measurement Circuits: Voltage/phase selection in metering panels

Building Automation: Dual HVAC unit switching, emergency lighting transfer

Telecom & Data Centers: Redundant PSU source selection

About CDADA

★ Our key advantages are: 

1) Complete international certifications, 

2) Strong OEM/ODM capability, 

3) High cost-performance ratio, 

4) Reliable large-scale production capacity, 

5) Extensive export experience.

★ Our products are successfully exported to Southeast Asia, the Middle East, South America, Africa, Europe, and CIS countries, with a strong focus on Belt and Road markets.

★ We invest continuously in R&D, monitor global standards and market trends, and collaborate with industry experts to upgrade our product portfolio.

Frequently Asked Questions

Q1: Can I switch under load? 

A1: Not recommended. The SF series 2P Changeover Switch has no arc extinguishing chamber. Always de-energize the circuit before switching, or use only for no-load transfer (e.g., isolator function). For live-load switching, consider motorized ATS or fused switch disconnectors.

Q2: Why is there an “O” (OFF) position? 

A2: The center OFF position ensures complete isolation from both power sources—essential for maintenance safety and preventing backfeed into generators or inverters.

Q3: Do I need fuses with this switch? 

A3: Yes. Since it cannot interrupt fault currents, always pair it with upstream fuses or MCBs rated for your system’s prospective short-circuit current.

Q4: Can it control motor direction? 

A4: Yes—for small motors, the 2P switch can reverse phase sequence when wired correctly. Ensure motor is stopped and de-energized before changing direction.

Q5: Why choose CDADA over other brands? 

A5: CDADA offers:

● True 3-position mechanical interlock (no floating states)

● DIN-rail compatibility with global panel standards

● Clear visual indication of switch position

● Robust spring mechanism for reliable contact pressure

● Competitive pricing with full IEC certification and technical support