Changeover and Bypass Switches
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Changeover and Bypass Switches

CHANGEOVER AND bypass switches Santon produce 3 ranges of manual changeover switches, the ‘anti-weld’ silver alloy which provide an exceptionally long mechanical Packet, Cam and Flat pack types. The Packet and Cam can life. Above 315A the contacts are paralleled to provide the higher ratings. be provided with or without off position and are available The maximum number of contact cells driven from a pair of mechanisms enclosed or as an open type for mounting in customers is 12. Switches requiring above 12 cells are ganged together in groups equipment, i.e. contol panels etc. of 2, 3 or 4...

TYPES Packet switch Flat pack type 20A Cam switch E(O)CX4.20 changeover Prefix O if Off position required. e.g. With off, RX becomes ORX. CX becomes OCX. The Flatpack is only available with off. As standard the packet switch and cam switch types are available in 2 and 4 pole arrangements. Other combinations of poles and ­ atings r can be produced on application. Flat pack switches are 4 pole form as standard. Changeover switches are suitable for 415v AC, switches with DC voltages are available on request. Order reference Rating AMPS AC22 415V Rotary cam Switch 2 Pole Rotary cam Switch 4...

5 Typical TERMINAL MARKINGS Packet switch Approx dimensions for enclosed Changeover switches. Thermoplastic IP65, Sheet steel IP54 Cam Switches (2 + 4 Pole) Switch Reference NOTE: Some CAM switches may have terminal markings as the packet switch. Overall Dimensions of Switches Excluding Handle. Cam Switches (4 pole) - Panel mounted with direct handle Switch Reference HxWxD­ (Volume only) Thermoplastic " " " " " " " Sheet Steel " " " " " " " " " Switch Reference Sheet Steel " " " " " " " " " " " " " " " Switch Reference Sheet Steel " " " " " " " " " " Packet Switches (4 pole) - Panel mounted...

Bypass SWITCHES The majority of installations which have a mains and a standby Normal Bypass. supply invariably incorporate an automatic changeover contactor to feed either supply to the load. Normal Position. Periodic examination and maintenance of the changeover con- Mains supply is fed to the input of the changeover contactor. The com- tactor is vital to ensure that it will function correctly in the event mon of the changeover contactor feeds the load. Note: the stand-by or generator must be connected directly to the changeover contactor. Bypass Position. The load is fed directly from...

MAINS SUPPLY BY-PASS SWITCH (shown in By-Pass position) CHANGEOVER CONTACTOR PANEL STANDBY SUPPLY Normal - Bypass. Normal Position. NORMAL Bypass Main supply is fed to the input of the changeover contactor. The com- mon of the changeover contactor feeds the load. Stand-by or generator supply is fed to the input of the changeover contactor. Bypass Position. The load is fed directly from the main supply. The changeover ­ ontactor c is isolated from the main and stand-by supplies as well as the load. 400A Packet switch Bypass type 3

Bypass SWITCHES Type 3. Standby Bypass - Normal Mains Bypass. Stand-By Bypass Position. The load is fed directly from the stand-by supply. The change­­ over contactor isolated from the main and stand-by supplies as well as the load. Mains Bypass Position. The load is fed directly from the main supply. The change­ ver o c ­ ontactor is isolated from the main and stand-by supplies as well as the load. Normal Position. Main supply is fed to the input of the changeover contactor. The common of the changeover contactor feeds the load. Stand-by or ­ enerator supply is fed to the input of the...

9 Bypass Switches Standard Order References. (4 pole – prefix ‘O’ for ‘Off’ position ). T YP E Options on Standard Bypass Switch packet switch and cam switch- type 1 and 2 bypass switches if required. An Off position can be provided on the type 3 packet switch only. 3. or 3 pole alternatives are available. 1,2 2. Auxiliary contacts can be provided to suit individual requirements. be provided for switches mounted behind hinged doors. 5. astell/Fortress interlocking is availaC ble to suit specific requirements. 6. Enclosed bypass switches are available upon request. 7. Make Before Break...

‘UPS’ Bypass SWITCHES GENERAL Bypass switches enable the load to be fed directly from the mains 63A Single phase & SN H6P-RA8 supply in the bypass position, whilst the UPS is disconnected. A test position is provided such that the UPS unit is energised when bypassed so tests can be made. UPS switches may be single pole & SN or TP & SN. Contacts used on UPS bypass switches are make before break, so as not to cause an interruption to the supply during switching. An aux contact is made in between the 'Normal' and 'Test' position. Other combination of auxiliaries can be supplied and are...

11 Overall Dimensions of Bypass Switch EXCLUDING HANDLE. Note: f required fitted into a sheet steel enclosure prefix I the reference with ‘E’ i.e.ECB1.4.40 Cam Switches Packet Switches Order Reference Order Reference Order Reference Flat Pack Switches

Technical Data The short circuit at the point of installation must be considered for all switches. The max fuselink for prospective short circuit is shown in the following table. Prospective Symm. Fault Current. 40 63 Maximum permissible Fuse Size Packet Switch Switch rating Prospective current 46 ka rms. max fuse STR A rms. for 1 sec Flat Pack Switches Changeover Max I sq t x 1000 (2) Flat Pack Switches Bypass Short Circuit Rated Rated making operational le operational le capacity (1) AC22 (415V) AC23 (415V) Cable Termination Sizes. Packet Switches Short Circuit Rated Rated making...