Auxiliary relay for railways

Type PC8AHX

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ABB is a global leader in Power and Automation technologies that enable utility and industry customers to improve performance while lowering environmental impact. The ABB Group of companies operates in around 100 countries and employs over 1,03,000 people. In India, ABB serves customers with the complete range of power and automation technologies. The company has a vast installed base, extensive manufacturing facilities and a countrywide marketing and service presence. As a part of its Power Technologies offering, ABB serves electric, gas and water utilities as well as industrial and commercial customers with a wide range of products, systems and services for power generation, transmission and distribution. ABB’s system offering ranges from Electrical Balance of Plant (EBOP) for power plants, bulk power transmission, turnkey substations and complete electrification to utility automation and power distribution. The product offering covers a wide spectrum of technologies across the entire voltage range including indoor and outdoor circuit breakers, air and gas insulated switchgear, disconnectors, capacitor banks, reactive power compensators, power transformers, distribution transformers, instrument transformers, Compact Secondary Substations (CSS) and Ring Main Units (RMU).

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Auxiliary relay for railways Type PC8AHX Features


7 heavy-duty contacts




Double interruption contacts




Contact configuration can be changed with ease




Field weakening resistor for low burden




Plug-in base mounting




Robust design for rolling stock

Application The PC8AHX relay is designed for use in rail vehicles, where a high degree of reliability and a high contact rating are stipulated, with minimal internal consumption. Acting as an instantaneous switching element, it provides galvanic separation and contact multiplication in protection, sequencing and signaling systems of locomotives. The relay has a proven design and it is suitable for critical electrical, mechanical and environmental requirements of railways.

Description The auxiliary relays type PC8AHX is an instantaneous, plunger-type relay with heavy-duty double interruption contacts. The relay picks up when 110 V DC is extended to terminal ‘a’ and ‘b’. It drops out when this voltage is interrupted. The PC8AHX relay has seven output contacts. The low pick-up value of the PC8AHX relay (approx. 50% of rated) along with the plunger movement of 3 mm and the strong restoring springs ensure that the holding force on the plunger is sufficiently large, both, in picked up and dropped out conditions. The strong holding force in turn ensures operational reliability in conditions of vibration and shock, expected in rail vehicles. The contacts are made of silver-palladium alloy and are gold plated. The special contact metallurgy assures contact life (electrical & mechanical durability) in severe environmental conditions expected in rail vehicles. The contacts have low resistance and unlike pure silver contacts, they can withstand noxious effects of tropical conditions and are free from sulphur attacks. This feature makes the relays suitable for higher switching rates. A transparent protective hood of polycarbonate material, that does not burn easily, provides good protection against dust. The plug-in mounting method is ideal for installation and servicing. Guide pins prevent the relay from being plugged in the wrong way round. The marking of the terminals on the base matches with that of the relay contacts.

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ABB

Technical data

Energizing quantities, rated values and limits Rated voltage UN

110 V DC

Operative voltage range

70 - 125 V DC

Pick-up voltage

< 70 V DC

Drop-out voltage

>10% of rated voltage

Permitted ambient temperature range

00C to +550C

Pick-up time at UN (typical)

20-30ms

Power consumption at rated voltage 110VDC

6 W(approx)

Mechanical durability – Tested according to IEC 77, IEC 255

1 Million switching operations & 200 Draw-out/Plug-in operations

Weight

0.8Kg

Contact data Contact configuration

4N/O+3N/C

Maximum voltage within contacts system

250V DC/AC

Rated current

5A

Max. making current

25 A

Max. Breaking capacities Voltage Contacts DC resistive load

1

24V 2 in parallel

1

48V 2 in parallel

1

110V 2 in parallel

1

250V 2 in parallel

2 in series

5A

10A

5A

10A

5A

7A

1A

-

5A

DC inductive. L/R =15ms 5A

10A

5A

8A

4A

-

1A

-

4A

DC inductive, L/R =40ms 4A

8A

4A

8A

3A

-

0.5A

-

2A

-

10A

-

10A

-

10A

-

-

AC resistive & inductive

10A

Breaking capacity: Tested according to IEC 77

3A, 180 Operations at 30 OP/Hr at 110 V DC and L/R 40 ms.

Making capacity: Tested according to IEC 77

25A, 180 Operations at 30 OP/Hr at 110 V DC and Resistive Load

Electrical endurance: Tested according to IEC 77, IEC 255-23

0.2 Million operations, at 110 V DC, 0.5A L/R 40 ms.

Terminals

Suitable for 2x2.5mm2 wires

Electrical tests Measurement of resistance; Tested acc. to IEC 77

+/- 10% of specified

Temperature-rise: Tested acc. to IEC 77,IEC 255

Coil (class B), Contact

Insulation resistance: Tested acc. to IEC 255-5

>100 M Ohm at 500 V DC

Dielectric: Tested acc. to IEC 77, 255-5

2.0 kV, 50 Hz, 1 min

Impulse: Tested acc. to IEC 255-5

5 kV, 1.2/50µs, 0.5J

Environmental tests Vibration: Tested acc. to IEC 77

+/- 3g, 2Hrs/ axis

Shock: Tested acc. to IEC 77

+/- 3g, 50Hz, 2min

Dry heat: Tested acc. to IEC 68-2-2

at +550C in energised condition

Dry cold: Tested acc. to IEC 68-2-1

at 00C

Damp heat (cyclic - 2days): Tested acc. to IEC 68-2-30

12 Hr/550C + 12 Hr/250 C x 2 @ 95% RH

Salt mist (cyclic - 7days): Tested acc. to IEC 77, IEC-68-2-52

2 Hr spray periods, 5% NaCl solution 22 Hr humidity storage periods, 93% RH

ABB

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Connection diagram and contact configuration

Fig. 1- Relay on plug-in base mounting

Legend – Aa : Terminals; Db: Mounting hole; E01: Cut-out for rear wiring; *: Space for removing hood; Dw: Field weakening resistor; 2): Fixing screw

Fig.2 Plug-in base mounting

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PC8AHX/12/2005/01-500

Dimensions