Tools

Power Distribution USAPower Distribution USA

Site ExplorerSite Explorer

Double Throw Safety Switches

Double throw switches are intended to transfer loads from one power source to another. All 2 & 3-pole double throw switches are suitable for use as service equipment including non-fusible versions when used in combination with a UL listed circuit breaker or fusible switch. All are UL Listed and both horsepower and load break rated. Switches are rated for use on systems up to 10,000A when protected with Class H fuses or 100,000A when protected with Class R or Class T fuses. They can also be used to connect a single source of power to either of two loads. In this application it is necessary to field modify fusible switches so that the fuses are on the load side of the switching mechanism. A cover interlock is provided on all ampere ratings. The operating handle may be padlocked in the off position.

Technical Data

Enclosures

  • NEMA 1, 3R, 12 or 4X

Type 1 enclosures are intended for indoor use primarily to
provide protection against contact with the enclosed equipment
in locations where unusual service conditions do not exist.

Type 3R enclosures are intended for outdoor use primarily to provide a degree of protection against falling rain and sleet and must remain undamaged by the formation of ice on the enclosure. They are not intended to provide protection against conditions such as dust, internal condensation, or internal icing.

Type 12 enclosures are intended for indoor use primarily to provide a degree of protection against dust, falling dirt and dripping water. They are not intended to provide protection against conditions such as internal condensation.

Type 4, 4X enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against windblown dust, rain, splashing water and hose-directed water. They are not intended to provide protection against conditions such as internal condensation or internal icing. Also meets 4X definition by providing a high degree of protection against corrosion. Siemens 30-200A stainless steel 4X switches are supplied stainless interior parts and hardware as standard.

Double Throw

Features/Ratings

30 through 60 Amps

800 and 1200 Amps

240Volt AC

600 Volt AC

240 Volt DC

Double break visible blade design (30-200A)

Quick-make, quick-break switching action

Highly visible ON/OFF handle indication

Padlockable cover latch

Padlockable handle

Dual voidable cover interlock

Type 1 enclosure

Type 3R enclosure

Type 12 enclosure

Type 4/4X enclosures

Generous wiring gutters that meet UL and NEC wire-bending space requirements

Lugs suitable for copper or aluminum at 60˚ or 75˚C

CU/AL wire lugs that meet UL 486B requirements

Suitable for field-convertible compression connectors

All plated copper current carrying parts
(except lugs)

Spring reinforced Fuse Clips
(except 30A general duty)

Clear pivoting line terminal shield

Replacement parts

Provisions for UL Class T, R and H Fuses

Provisions for UL Class J and L Fuses

Metal nameplate

Aux. switch kits

Isolated ground kits


Did this information help you?