ABB OS Switch Fuses

• OS manual switch-fuse products are used for feeder isolation and fuse-protected distribution circuits.
• ABB’s small-frame Gamma catalogue covers OS32–160; larger OS sizes and their configurations are covered by the wider OS/OSM catalogue.
• Fuse formats include DIN, BS, NFC and UL-related versions within the documented product ranges. They are alternatives tied to specific products, not interchangeable fuse holders.
• Three- and four-pole arrangements and operation/accessory options depend on the ordered version.

Ratings, Fuse System & Standards

ABB provides IEC technical ratings according to IEC 60947-3. Check operational current at the actual voltage and utilization category, rather than selecting solely from a frame designation or thermal-current value. AC-23 ratings apply to the stated switching duty and conditions; they must not be assumed for every voltage or arrangement.

Confirm fuse standard, size, current rating, class and the applicable short-circuit coordination data. The fuse link provides overcurrent protection; the required performance depends on the specified switch-and-fuse combination. A UL fuse format alone does not establish approval of every OS version for a North American installation.

Installation & Accessory Checks

Confirm pole configuration, neutral arrangement, mounting orientation, available space, cable or busbar connection and operating position. Check the exact handle, shaft, interlock, auxiliary contacts and terminal protection required. Some product versions are supplied without a handle or shaft.

Enclosure temperature, ventilation, fuse power loss and installation orientation can change permissible loading. Use the conditions in the applicable ABB data sheet rather than treating a catalogue maximum as a rating for all OS models. OSM motor-operated products have their own operating and control requirements.

OS Selection & Requesting a Quote

Send the complete OS model, ABB Order Code / Article Number, quantity and destination country. Include system voltage and AC/DC application, load/current and switching duty, number of poles, fuse standard/size/class, mounting and operating arrangement, and required accessories. For an existing panel, provide the nameplate, fuse markings, handle/shaft details and installation photos.

Request a quote through Contact. Existing reference codes are retained; older configurations need their own technical confirmation.

Technical references: ABB OS Gamma catalogue and ABB OS/OSM switch-fuse catalogue.