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Breaker Control Switches
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Breaker Control Switches
 
RECOM RBC Control Switches are essentially recommended for use in variety of industrial applications like (a) Control of TRIP/CLOSE circuits in Circuit Breakers (b) CONTROL operations in Machine Tools and (c) Switching of control/instrumentation circuits in Switchgear, Controller, Relay Panel and other machinery. Equipment /plants for steel, textile, process control, cement, paper, chemicals, fertilizers, shipbuilding, railways, mining etc. Versatile design of these switches make possible a wide vanety of switching arrangements to suit specific programme specification requirements. These Control Switches are improved/new version and incorporate internationally accepted design of Cam Operated silver-alloy Butt contacts with double-break feature, dust protected and assembled on packet principle (stacking type and manually operated by a pistol grip handle through a sturdy mechanism.
 
ELECTRICAL DATA / SPECIFICATION
RBC Control Switches RBC 16 RBC 20 RBC 25 RBC 32 RBC 40 RBC 50
Current Amps. Ith (Thermal) 16 20 25 32 40 50
Current Amps Continuous 12 16 20 25 32 40
Voltage Operational A. C. & D. C. 660 660 660 660 660 660
High Voltage Test 2.5KV 2.5KV 2.5KV 2.5KV 2.5KV 2.5KV
r. m. s. r. m. s. r. m. s. r. m. s. r. m. s. r. m. s.
Frequency of Operation 200 200 200 200 200 200
Switching cycles per hour (max)
Temperature conditions ambient 55 55 55 55 55 55 55
degree centre (max.)
Breaking Capacity A. C. at 440V 0.3 pf. lag (Over 50,000 Operations)
 
Breaking Capacity D. C. per single cell. As per Table given below :
 
B R E A K I N G     C A P A C I T Y    I N    A M P S
Volt. (RBC) ResistiveCurrent in Amps. (RBC) Inductive Current in Amps.
D. C. 10 m. s. TC 20 m. s. TC 40 m. s. TC
16 20 25 32 40 50 16 20 25 32 40 50 16 20 25 32 40 50 16 20 25 32 40 50
50 10 15 20 25 32 40 5 10 15 20 25 30 2.5 5.0 15 17.5 20 25 1.5 3.0 4.0 6.0 7.5 10
125 1.5 2.0 2.5 3.0 4.0 5.0 0.5 1.0 2.0 3.0 4.0 5.0 0.35 0.5 1.0 2.0 3.0 5.0 0.15 0.35 0.5 0.75 1.5 2.0
250 0.75 1.0 1.5 2.0 2.5 3.0 0.25 0.5 1.0 1.5 2.0 2.5 0.15 0.3 0.75 1.0 1.5 2.0 0.15 0.25 0.35 0.50 0.65 0.75
 

For Breaking Higher D. C. at different Time Constants at above voltages Switches are assembled with TWO or more contacts in series A maximum of two contacts in series in recommended.

RANGE :

 
“RBC” Control Switches (also called Selector Switches) are manufactured incorporating following features / arrangements:

1. Spring Return Switches:

  Basic Type – As a standard the switching angle is 45° and operate (spring return) on either side of the Neutral position. On request other switching angles of 30°, 60° and 90° are provided.
   
  Lost Motion Device – This device is incorporated in basic spring return switches to operate a separate assembly of contacts added at the rear portion. These contacts are set to close or open by resetting arrangement when the handle is operated to the extreme opposite direction from original (Neutral).
   
  Sequence Locking Device – This mechanical device is incorporated in basic spring return switches to prevent two consecutive operations in the clockwise direction from Neutral position (trip-Free arrangement).
   
  Auxiliary Switching – Control Switches are recommended for auxiliary switching in circuit breakers. These are with standard Spring Return to Neutral mechanism having normally open and normally close contact combination as required. On the operating shaft a suitable lever is fixed which is linked to the circuit breaker mechanism. Details to be provided by the user.
   

2.Stayput Switches:
A wide range is manufactured to suit variety of switching combinations. Standard range consist of switching combinations link ON-OFF, 2, 4, 6, 8, and upto  12 ways with switching angles 90°, 60°, 45° and 30°.

3.Stayput / Spring Return Switches:
Spring return arrangement is incorporated in standard stayput switches. Only one spring return position on either side of 0 is possible at the extreme end of the stayput positions.


4.Headlines:

  Pistol Grip Handle – MK II – This handle is supplied as a standard for all spring return switches, stayput switches and combination of stayput/spring return switches of 40A ratings.
   
  Pistol Grip Handle – This pistol grip handle is supplied as a standard on all 25A rated switches.
   
  Knob (Wing Type) – This handle is supplied as a standard for all stayput switches of 3/4 packets assembly. For higher packets, pistol grip handle in either (a) or (b) above is recommended.
   
   

5. Centre Key Locking:
This attachment consist of barrel type lock with key in the centre. It is lockable and key is removable only in the locked position (0°, 90°, 180° and 270°) and available in two types of handles (1) Lever Shape (2) Wing (Knob/Tee) shape. While ordering switches, correct choice of the handle to be specified.

6. Indicating/Escutcheon Plate:
This plate consist of two parts viz:

  Plain plate made of anodized aluminium of size 83 X 70 with white letters on black background. Standard markings available mentioned elsewhere.
   
  Shroud moulded from engineering plastic of black colour of size 88 X 75 in which the plain plate is seated and is fixed by 2 screws for non-lock and lock switches.

All switches are supplied with these indicating plates with standard markings. Plates with non-standard markings are also supplied as per specific requirements.

 

COMPONENT SPECIFICATIONS :
Control switch is an assembly of component parts viz.

  • Packets - Moulded from Glass Filled Nylon wich is an engineerning thermoplastic material having excellent properties like - high insulation, anti-tracking, self extinguishing, fire retardant and impact/fracture proof.
  • Mechanism Housing - The mechanism housing is also moulded from same material as switching packets and contain other parts which provide indexing positions.
  • Contact/Terminals - Fixed and moving contact parts are of brass (electrical grade) suitably electroplated on which Bimetal Button contacts Silver-Alloy (Silver Cadmium Oxide-Ag Cd O) are rivetted for make break operations. Each packet contains two electrically independent contacts. The outside ends of the fixed contacts are recessed type designed for connections by means of M3.5 or M4 size panhead screw and clamped tight by arched spring washers. Terminals are suitable to carry wires upto 4mm sw. or 4mm crimped terminals.
  • Cams - These are moulded from engineering plastic and variety of standard Cam profiles are available to satisfy standard as well as any odd switching combination.
  • Contact Springs - Each moving contact is assisted by a part of springs of stainless steel to provide uniform contact pressure ensuring higher contact life.
  • Other Parts - Above components are assembled by means of suitable hardware and fitted with mounting plate. The indexing mechanism and Cams in the contact assembly are operated by a steel shaft with a suitable handle.

ORDERING 'RBC' SWITCHES :
Considering the variables in this range, it is necessary to provide complete information with your inquiry/order, preferably in 'Switch Order Sheet' available on request, for expeditious handling. The essential information required is :

  • Breaking current
  • Voltage
  • AC or DC System
  • L/R Ratio or Time Constant
  • Type of Load
  • Switching Sequence in each of the position Control/Selector Switches and for Breaker Control Switches in Trip-Neutral-Close and Lost Motion Contacts and Sequence Locking Device.
  • No. of Positions
  • Indexing Degree
  • Mounting
  • Type of Handle
  • Extra features-Locks and locking positions.
Non-lockable :
 
 
Lockable :
 
 
Front View :
 
 
 
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