Cam switches. Page. Overview 4-2. ON-OFF switches, main switches, maintenance switches 4-3. Changeover switches, reversing switches 4-5

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1 Eaton Wiring Manual / Page Overview - ON-OFF switches, main switches, maintenance switches - Changeover switches, reversing switches - (Reversing) star-delta switches - Multi-Speed Switches - Interlock circuits - Single-phase approach circuits - Meter changeover Switches - Heater switches - Step switches - -

2 Cam switches Overview Use and designs Eaton cam switches and switch-disconnectors are used as: a Main switches, main switches used as Emergency-Stop devices, b ON-OFF switches, c Safety switches, d Changeover switches, e Reversing switches, star-delta switches, multi-speed switches, f Step switches, control switches, coding switches, meter selector switches. Eaton Wiring Manual / The following designs are available: g Flush mounting, h Centre mounting, i Surface mounting, j Service distribution board mounting, k Rear mounting. Refer to the latest issue of our main catalog for Industrial Switchgear. Other contact arrangements are listed in the K special catalog in addition to the switches listed in the main catalog. ( (Catalogs)). Basic part I u Use as Design number [A] TM x x x T x x x x x + + T x x x x + + TB x x x x x + + T x x x + + T x x + + T ) x x + + P- x x x P- x x x P- x x x P- x x x P- x x + + P- x x + + P- x x + + P- x x + + I u = max. Rated uninterrupted current ) In enclosed version (surface mounting), max. A. Irrespective of the number of contact units, function and process. + Irrespective of the number of contact units, function and contact sequence. -

3 Eaton Wiring Manual / Cam switches ON-OFF switches, main switches, maintenance switches On-Off switches, main switches T-- P- P- P- P- P- P- P- P- OFF ON FS Maintenance switches (safety switches) with auxiliary contacts T-- OFF FS P-/.../ P-/.../ P-/.../ P-/.../...N/NHI OFF ON ON L L L L L L FS ) Load shedding contact N L L L N N N N N ) ) These switches can also be used as switch-disconnectors for lighting, heating or combined loads. Main switches to IEC/EN ; for rear mounting switches with door interlock, padlocking feature, finger proof incoming terminals, N and PE terminal, red thumb-grip handle (black, if required), warning label. If it is not clear which drive is associated with which main switch, an additional maintenance switch is required close to each drive. Maintenance switches are fitted to electrical machines or installations to provide safe working conditions in accordance with the safety regulations. By attaching his own padlock to the SVB padlocking feature, the electrician can protect himself against anyone switching on without authorization ( Section Circuit diagram example for maintenance switches with a load shedding contact and (or) switch position indicator, page -). -

4 Eaton Wiring Manual / Cam switches ON-OFF switches, main switches, maintenance switches Circuit diagram example for maintenance switches with a load shedding contact and (or) switch position indicator L L L N Q Q F F U V W M P P F F O I Q T()-- maintenance switch FAZ- B/-HS Q A A Function Load shedding: When switching on, the main current contacts close first, then the contactor is activated via the late-make N/O contact. When switching off, the contactor is first disconnected by opening the early-make contact, then the main contacts isolate the motor supply. Switch position indication: The position of the switch can be signalled to the control panel or control room via additional NO and NC contacts. P: On P: Off Q: Load shedding T()-- circuit symbol -,-,- -,- - -

5 Changeover switches, reversing switches Eaton Wiring Manual / Changeover switch T-- T-- TB-- T-- T-- T-- FS L L L Reversing switches T-- T-- TB-- T-- FS L L L -

6 (Reversing) star-delta switches Eaton Wiring Manual / Star-delta switches T-- T-- Y FS TB-- T-- L L L W U W U YΔ V V Reversing star-delta switches T-- T-- Y Y FS W W V LLL U U V SOND ) Y Y ) Standard contactor interlock Section Interlock circuits, page - -

7 Multi-Speed Switches Eaton Wiring Manual / speeds, operating direction Tapped winding T-- T-- TB-- T-- FS LLL U W V W U V without connections separate windings T-- T-- TB-- T-- FS LLL U U W V W V -

8 Multi-Speed Switches Eaton Wiring Manual / speeds, operating directions Tapped winding T-- T-- FS L L L U W V W U V separate windings, operating directions T-- T-- FS U W V LLL U W V -

9 Multi-Speed Switches Eaton Wiring Manual / speeds, operating direction Tapped winding arrangement, single winding for low speed T-- T-- TB-- T-- FS L L L U W U V U W V W V A -(A) - (B)Δ = (B) B -

10 Multi-Speed Switches Eaton Wiring Manual / speeds, operating direction Tapped winding arrangement, single winding for high speed T-- T-- FS TB-- T-- FS L L L U W U V U W V W V A -(B)Δ- (B) -(A) B -

11 Interlock circuits Interlock circuits between cam switches and contactors with overload relays provide neat and economical solutions for many switching drive tasks. The following points are common to all interlock circuits: Without mains disconnection (SOND ) Mains disconnection only by contactor primarily for star-delta connection Q F F S Q Q Q Control section SOND Power section without mains disconnection Circuit as required Eaton Wiring Manual / Protection against automatic restarting after a motor overload or voltage failure The facility for remote disconnection (e.g. emergency-stop) can be provided by one or more Off pushbuttons. With mains disconnection (SOND ) Mains disconnection by contactor and switch Q F F S Q Q Q Control section SOND Power section without mains disconnection Circuit as required M ~ M ~ Interlock with contactor (SOND ) Contactor can be energized only when switch is in an operating position Interlock with contactor (SOND ) Contactor can be energized only when switch is in an operating position Q F Q F F S Q S Q Control section SOND Power section F S S Q Q Control section SOND Power section Q Q Circuit as required Circuit as required M ~ M ~ -

12 Single-phase approach circuits Meter changeover switches enable you to measure currents, voltages and power in Voltmeter changeover switches T-- x phase to phase x phase to neutral with off position Eaton Wiring Manual / three-phase systems with only one measuring device. T-- x phase to neutral without off position L-L L-N L-L L-N L-L L-N FS LLL N V L-L L-L L-L L-N L-N L-N L-L L-L L-L FS V LLL L-L L-L L-L Ammeter changeover switches T-- T-- For direct measurement L L L FS A LL L LLL LLL -

13 Meter changeover Switches Eaton Wiring Manual / Ammeter changeover switch T-- T-- For measurement via transformers, complete rotation possible L L L FS L L L A LLL Power monitoring-changeover switches T-- T-- Two-phase method (Aron circuit) for three-cable installations loaded as required. The total wattage is calculated by adding together the two wattages. FS The Aron circuit will give a correct result for four-cable systems only when the sum of the currents equals zero, i.e. only when the four-cable system is balanced. L L L W -

14 Heater switches Eaton Wiring Manual / pole disconnection, steps T-- T-- TB-- FS L LL I II III I II III T--, complete rotation possible + FS + Further heater switches, and pole, with alternative circuitry, output stages, and number of steps are described in the main catalog, Industrial Switchgear and in the special catalog K D/F/GB (Article no. ). -

15 Step switches Eaton Wiring Manual / One step closed in each position, complete rotation possible T-- T-- FS -

16 Step switches Eaton Wiring Manual / Stay-put switches On-Off stay-put switch pole: T-- pole: T-- -pole: T-- FS Changeover switches pole: T-- pole: T-- -pole: T-- FS pole: T-- pole: T-- -pole: T-- HAND AUTO FS HAND AUTO On-Off stay-put switches pole: T-- pole: T-- -pole: T-- With pulsed contact in the intermediate position ON OFF FS -