Datasheet 3E-3 (Issue 3.0) Relay Style QBCA1 - Invensys Rail

Relay Style QBCA1
Heavy duty dc biased contactor relay
• AC immune contactor relay
• DC Biased
• Complies with BR specification 943 or 966, Appendix F4
• Heavy duty
• Contacts and connections suit direct switching of point
machines
Heavy duty
Two sets of heavy duty front contacts
and magnetic blowouts for double
cutting high current dc or ac loads,
such as point machines.
Use in AC Electrified Territory
Immune to false operation from
induced ac induced voltages,
making it a relay of choice in ac
electrified territory
DC Biased
QBCA1 relays operate on normal
voltage polarity only. Connect two
relays with opposite polarity for two
wire point control and similar
circuits.
Bias levels are maintained even with
reasonable levels of forward and
reverse overvoltage.
Datasheet 3E-3

Description
A single wound dc biased ac immune
relay, compliant with
BR Specifications 943 or 966
Appendix F4.
Heavy Duty Contacts
Fitted with two heavy duty front
contacts with magnetic blowouts.
Each heavy duty contact terminal is
connected to two plugboard
connectors.
Wire each connector with two wires in
parallel to handle heavy currents. For
efficient operation of the magnetic
blowouts in dc operation, set the
connection polarity as shown below.
Recommended Wiring 1
• Arrangement of connection of back
contacts to detect welded heavy
duty front contact.
A5 A6 D5 D6
A7 A8 D7 D8
Use this arrangement to give
detection of a welded heavy–duty
front contact.
• Arrangement of connecting wires to
the heavy–duty front contacts.
+ ~
PLUGBOARD
C1
C2
Observe the polarities shown when
using a dc supply.
1. Wiring diagrams based on diagrams in BR
Specifications 943 and 966 Appendix 4.
C3
C4
Specifications (20°C)
Piece
number
Nominal
working
volts
Contacts Coil
resistance
ohms
179–185 Normanby Rd (Locked Bag 66), South Melbourne, Victoria 3205, Australia
T +61 1300 724 518 F +61 3 9233 8777 ABN 78 000 102 483
E enquiries.asiapacific@invensysrail.com W http://www.invensysrail.com
Maximum
full
operating
volts
Datasheet 3E-3 issue 3.0
Minimum
release
volts
Piece
number
Plugboard
Code
holes
M25066 50 2HF4B 940 40 7.5 M23430 BCFHK
M25067 24 2HF4B 195 19.2 3.6 M23429 BCEJK
M25068 50 2HF4F4B 940 40 7.5 M25451 BEGHJ
M25069 24 2HF4F4B 195 19.2 3.6 M25452 BEFHJ
M25070 12 2HF4F4B 55 9.6 1.8 M25479 ABCKS
M25098 50 2HF6B 940 40 7.5 M25495 ADFHS
Power
Less than 3 W
consumption
Reverse Polarity Up to 20 times rated voltage without
operating
Immunised 12 V relay 500 V ac
24 V relay 1000 V ac
50 V relay 1000 V ac
Heavy Duty
Contacts
Make and carry 30 A @ 110 V ac or dc for 10 s (50% duty cycle)
Layout of Contacts (Rear View)
Contacts: F = Front, B = Back
Break 30 A @ 110 V ac or dc > 500 times
Break 100 A dc @ 130 V at least once
Not weld at < 200 A dc 130 Vdc prospective
A B C D A B C D A B C D
1
2
SUPPLY
+
1
2
F SUPPLY
+
F SUPPLY
+
3
4
HF
+
3
4
F
HF
+
F B
HF
+
B
LOAD
5
B LOAD
-
B
HF
-
5
6 6
7
B B 7
8 8
SUPPLY
LOAD
B LOAD
-
HF
LOAD
B B B B
-
-
SUPPLY
B B LOAD
-
HF
SUPPLY
R1 C+ C- R2 C+ C- C+ C-
R3 R4
2HF 4B
BR Spec 943
2HF 4F 4B
BR Spec 966
App F4
2HF 6B
B