Two-Speed Dahlander Switches Selection Guide: Technical Criteria & Application Standards
Two-Speed Dahlander Switches selection guide: technical parameters, mounting and compliance standards, and Metop, Siemens comparison.
A two-speed Dahlander switch is a cam switch that changes the winding ends of a three-phase asynchronous motor with a Dahlander winding between the low-speed and high-speed connections. It is used to change speed by hand on fan, pump, machine tool and conveyor motors that obtain two different speeds from a single winding. The category includes Metop brand models in currents such as 16 A, 25 A, 40 A, 63 A and 125 A, with a 1-0-2 arrangement and continuously rotating models that repeat the 0-1-2 sequence. Choose the current according to the larger of the motor's two nameplate currents at the two speeds, the position arrangement according to how the machine is used, and compare the connection with the motor's terminal block diagram. A Dahlander switch must not be confused with the switch for two-speed motors with separate windings; in a Dahlander connection the pole count of a single winding is changed, and the wiring diagram is different. The Two-Speed Dahlander Switches category on Welibaba includes 21 active models from leading manufacturers such as Metop, Siemens.
Key Technical Parameters for Selecting Two-Speed Dahlander Switches
To specify the right Two-Speed Dahlander Switches model for your panel or installation, verify the following parameters against your engineering schedule:
| Parameter | Typical Catalog Values | Verification Note |
|---|---|---|
| Current | 100 A, 125 A, 16 A, 20 A | Verify against project schedule and load calculation |
| Standards | EN 60947-3, VDE0660, TS EN 60947-3 | Verify against project schedule and load calculation |
| Rated Insulation Voltage (Ui) | 660 V | Verify against project schedule and load calculation |
| Ambient Temperature | -25... +50 °C | Verify against project schedule and load calculation |
Installation, Compatibility, and Commissioning Checklist
- Electrical & Mechanical Matching: Confirm that rated voltage, current capacity, and mounting dimensions align with the upstream and downstream components in Cam Switches.
- Environmental & Enclosure Rating: Check IP protection class, housing material, and terminal capacity for dusty, humid, or high-vibration industrial environments.
- Related Product Groups: If your application calls for a different form factor or rating, compare sibling categories such as On-Off Switches, Gas-Shielded Welding Machine Switches, Step Switches.
Frequently Asked Questions
What is the first parameter to check when selecting Two-Speed Dahlander Switches?
Start by confirming the circuit's rated electrical values and physical mounting dimensions, then use the technical attribute filters on the Two-Speed Dahlander Switches page to narrow down compatible series.
Which Two-Speed Dahlander Switches brands are available on Welibaba?
Welibaba currently stocks 21 active models in this category from manufacturers including Metop, Siemens, complete with verified specifications and unit pricing.
How can I compare Two-Speed Dahlander Switches models by manufacturer part number?
You can search directly by manufacturer SKU/order code or use the category filter panel to compare equivalent models across brands side by side.