Vertical Type Load Break Switches Selection Guide: Technical Criteria & Application Standards
Vertical Type Load Break Switches selection guide: technical parameters, mounting and compliance standards, and Siemens, Schneider Electric comparison.
A vertical type fused load break switch is a three-phase combination of a switch and fuses that carries NH blade fuses in a vertical position and can be opened and closed under load. It is used in low-voltage distribution panels to protect main supply and outgoing lines and to isolate them for maintenance. Choose the rated current and the NH fuse size according to the line current and the tripping type according to the mode of operation, and check whether a current transformer is needed. The Sigma SDY series comes in rated currents of 160, 250, 400, 630, 800 and 1250 A and NH fuse sizes NH00-NH00C, NH1, NH2 and NH3. Those that open the phases together break all phases in a single operation, while those opened separately allow each phase to be operated individually. Models with a current transformer are for measurement, and the 250 A models with a right or left side outlet are split according to the busbar direction in the panel. The 1250 A models have a 2x630 A parallel connection structure. A load break switch does not replace an automatic switch or a molded case circuit breaker; short-circuit protection comes from the fuse. The Vertical Type Load Break Switches category on Welibaba includes 25 active models from leading manufacturers such as Siemens, Schneider Electric.
Key Technical Parameters for Selecting Vertical Type Load Break Switches
To specify the right Vertical Type Load Break Switches model for your panel or installation, verify the following parameters against your engineering schedule:
| Parameter | Typical Catalog Values | Verification Note |
|---|---|---|
| Product Type | Sigortalı yük ayırıcı, Yük Ayırıcı | Verify against project schedule and load calculation |
| Model | 3NJ4101-3BF01, 3NJ4103-3BF01, 3NJ4103-3BF02, 3NJ4103-3BR02 | Verify against project schedule and load calculation |
| Connection Type | F70 blok klemens, M10 yassı bağlantı, M12 yassı bağlantı, M8 yassı bağlantı | Verify against project schedule and load calculation |
| Rated Current | 160 A, 160* A, 250 A, 400 A | 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 Load Break 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 Horizontal Type Load Break Switches.
Frequently Asked Questions
What is the first parameter to check when selecting Vertical Type Load Break Switches?
Start by confirming the circuit's rated electrical values and physical mounting dimensions, then use the technical attribute filters on the Vertical Type Load Break Switches page to narrow down compatible series.
Which Vertical Type Load Break Switches brands are available on Welibaba?
Welibaba currently stocks 25 active models in this category from manufacturers including Siemens, Schneider Electric, complete with verified specifications and unit pricing.
How can I compare Vertical Type Load Break 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.