Safety-Knob Handle No more risk of electrical shock. The operator's fingers stay out of reach of current-carrying components by using a standard 5/16 inch nut driver to open and close the switch. Just fit the nut driver over our patented safety knob and pull up to open or down to close. Of course, the W3TS switch can always be operated by hand. (See Safety Knob Instructions.)










Thermoplastic
Mounting Plate The right-angle foot of our patented barrier wraps around each switch to form a fail-safe non-conductive backing for the switch block - no metal mounting plate or potting is needed. The backing serves as a thermoplastic mounting plate requiring no additional insulation. This assures a safer, more reliable switch. The footed barriers are extra high and permanently mounted to provide maximum circuit isolation. The thermoplastic mounting plate is reinforced by a rod mount which supports the weight of the block.












Special Blade Shape The copper blade is shaped so that the edge of the blade enters at a right angle to the jaw. This keeps the full width of the blade in contact with the jaw as it enters or exits, making a better connection.











One-Piece Hinge Jaw One piece construction of the hinge jaw eliminates unnecessary multiple connection points.











Contact Jaw The contact jaw, a spring in itself, assures a low resistance contact and no overheating.











Fixed Terminal Studs The #10-32 stud terminals on which wiring connections are made are squared against the switch base and cannot be turned or backed out.












Short-Circuit Element The short-circuiting switch has a rugged make-before-break element to short the secondary of a current transformer. Its positive stop prevents the blade from lifting out of contact with the element. A brass common bar completes the circuit to the adjoining pole.












Test Jack The test jack eliminates the possibility of opening current transformer secondaries. It provides easy measurements in current circuits without disturbing permanent wiring. The test jack only carries current when making a measurement because it is shunted by a standard switch blade that stays closed except when the test jack is used. A dual-circuit test plug inserted into the test jack puts the measuring instrument in series with the current circuit.












5/8 Inch Centers The W3TS switch is compact and space-saving.












Ganged Handles Switches can be operated independently, or insulated yoking bars can gang any number of switch handles together for simultaneous operation.












Rod Mount The rod mount supports the weight of the switch block and reinforces the non-conductive mounting plate formed by the footed barriers.












Stainless Steel Mounting Ears At each end of the switch block, triple-slotted smounting ears securely mount the block to panelboard, switchboard or other surface.












Color-Coded Handles Standard colors are red for potential elements and black for current elements.Other colors are available by special order.













Marker Tag Each safety-knob handle is slotted for insertion of a tag to mark or code individual poles. A specification drawing for customer-supplied marker tags is available on the specifications page .












Standards Compliance The TestSwitch  W3TS knife blade miniature test switch has qualified under IEEE Standard C37.90, Standard for Relay and Relay Systems Associated with Electric Power Apparatus.

Underwriters Laboratories, Inc. qualifies TestSwitch's W3TS knife blade miniature test switch at 600 Volts, 30 Amps in the United States and Canada under UL Standard 414 (7th Edition) and Standard C 22.2 No. 115-M1989 -- Standards for Meter Socket Bases and Associated Assemblies, Meter Switches. Refer to file No. E189531.

The TestSwitch  manufacturing process is in compliance with Quality Standard ISO 9001:2000.












Tamper-Proof Covers Covers are attached to two insulated studs with holes for wire seals. All back-connected switches come with covers. Covers are also available for front connected switches.











1 to 52 Poles in a Single Block Unit construction allows unlimited arrangements of up to 52 poles in a single block.