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Railway Signalling Electromagnetic Relays

We are Manufacture of Singalling Relays, Railway Singalling Relays, Railway Signalling Electromagnetic Relays, Neutral Line Relays, Track Relays, Biased Relays, Latch Relays, Slow In Action Relays, RDSO Singalling Relay, RDSO Railway Singalling Relay, RDSO Railway Signalling Electromagnetic Relay, RDSO Neutral Line Relay, RDSO Track Relay, RDSO Biased Relay, RDSO Latch Relay, RDSO Slow In Action Relays

Manufacture of Singalling Relays, Manufacture of Singalling Relay

Manufacture of Railway Singalling Relays, Manufacture of Railway Singalling Relay

Manufacture of Railway Signalling Electromagnetic Relays, Manufacture of Railway Signalling Electromagnetic Relay

Manufacture of Neutral Line Relays, Manufacture of Neutral Line Relay

Manufacture of Track Relays, Manufacture of Track Relay

Manufacture of Biased Relays, Manufacture of Biased Relay

Manufacture of Latch Relays, Manufacture of Latch Relay

Manufacture of Slow In Action Relays, Manufacture of Slow In Action Relay

Manufacture of RDSO Approved Signalling Relays, Manufacture of RDSO Approved Signalling Relay

Manufacture of RDSO Approved Railway Signalling Relays, Manufacture of RDSO Approved Railway Signalling Relay

Manufacture of RDSO Approved Signalling Electromagnetic Relays, Manufacture of RDSO Approved Signalling Electromagnetic Relay

SIGNALING RELAYS
We offers a wide range of Q SERIES RAILWAY SIGNALLING RELAYS to meet all types of Signalling
Circuit Applications such as Route Relay Interlocking, Panel Interlocking, Automatic Signalling,
Point Operation and Track Circuiting. Each individual type of relay undergoes extensive TYPE TESTING
by Research  Design and Standards Organization (R.D.S.O., Lucknow) of the Indian Railways and
approved for use in Railway signalling circuits.

NEUTRAL LINE RELAYS
This is a DC neutral line relay fitted with independent non-fusible contacts.
It meets the requirements of relevant BRB Spec.

Relay types covered under this category are:
QN1 -  Line Relay complying with BRS 930.
QNA1 -  AC immune Line Relay complying with BRS 931A.
QS3 & QN1K -  Neutral Line sensitive Relay complying with BRS 930
QNN1 - Twin Line Relay complying with BRS 960.
QNNA1 - Twin AC Immune Relay complying with BRS 966 F6.
QNA1K - AC immune, DC neutral, tractive armature, line relay with BRS 931 A.

TRACK RELAYS
These are tractive armature; DC neutral track relays designed for use in DC track Railway Signalling circuits.
The contacts are Silver Impregnated Graphite to Silver.

Relay types covered under this category are:
QT2 - DC Track Relay to BRS 938 A
QTA1 - DC AC Immune Track Relay complying with BRS 939A
QTA2 - DC AC Immune Track Relay complying with BRS 966 F2
QBAT - DC Baised AC Immune Track Relay as per RDSO spec RDSO/SPN/84-88.

BIASED RELAYS
These are miniature AC immune, DC biased; tractive armature line relays designed for Railway Signalling 
purposes where the operation of the relay is dependent on the polarity of the coil current in the circuits 
and where alternating currents at industrial frequencies (50 Hz) may be present.

Relay types covered under this category are:
QBA1 - DC Biased AC Immune Line Relay complying with BRS 932A
QBBA1 - Twin DC Biased AC Immune Line Relay complying with BRS 961
QBCA1 - DC Biased AC Immune Point Contactor Relay complying with
BRS 943 and 966 F4.

LAMP PROVING
These are AC operated tractive armature miniature relays designed for use in Railway Signalling Lamp 
Proving & LED Circuits. The contacts are Silver Impregnated Graphite to Silver. These relays comply 
with BRB Specifications 941A and in some special cases governed by Indian Railway requirement.
Individual relays of this style have different characteristics or operating parameters to meet a variety
of lamp proving & LED needs. All relays are sl ed to some extent where "Supply Interruption Time"
is guaranteed. The same is mentioned in the detailed specifications.

LATCH RELAYS
These are DC tractive armature magnetically latched line relays, designed for use where a self-latching
relay with a separate release winding is required. The relay is held in full operating condition by a
permanent magnet, releasing only when the release coil is energized. A high back stop pressure
ensures that the armature will not move and latch up accidentally due to vibration. The contacts are
Silver Impregnated Graphite to Silver and the relay complies with BRB Specs. 935 A.

SLOW IN ACTION RELAYS
These are slow operate, AC immune, DC neutral line relays, designed primarily as a track circuit
repeater relay for use in circuits or where release time sufficient to cover the transit time of an
AC immune neutral line relay.

Relay types covered under this category are:
QSPA1 - AC Immune DC neutral line, slow to pick up relays as per BRS 933A.
QSRA1 - AC Immune DC neutral line, slow to release relays as per BRS 934A.

OTHER RELAYS
AC tractive armature line relay to be driven from 110 Volts AC design for interfacing between the
electronic circuitry of "Solid State Interlocking" or " Computer Based Interlocking " systems and
other equipments.

Relay types covered under this category are:
QNHX1 - AC tractive, 110V AC relay complying with BRS 966 F7.
QNHXC1 - AC tractive, 110V AC relay complying with BRS 966 F7.

Relays in Railway Signalling
Relay manufacturers for Railway Control System say that the system of relays is used to keep trains
on the right track and conduct traffic. Since trains are heavy, produce immense inertia and run on
fixed tracks the chances of collision increases substantially.

The relays that are used for railway signalling are mostly large considering voltages and currents that
are switched are small. The railway signalling circuits are highly reliable that use special techniques
to detect and prevent failures in the relay system.

There are two main types of relays used for railway signalling:
Track relays - They are connected across the track circuit.
Line relays -The relays that are used for any other purpose except for track are the line relays.

Metal to Metal TM type signalling relays for the Indian Railways with technical specification of RDSO

When an electric current passes through a conductor a magnetic field is produced around the conductor.
This effect can be easily demonstrated by showing that a compass needle is deflected when placed near 
a wire carrying an electric current. If the wire is coiled in a spiral, then the magnetic field will be perpendicular 
to the direction of the current.

In an electromagnet a wire is wrapped around a soft iron core. When current is passed through the wire the 
core carries the magnetic flux and behaves like a bar magnet. This type of magnet has the advantage that 
the magnet field can be switched on or off.

A relay is an electromechanical switching device. It has one or more contacts for opening and closing circuits.
A movable metal strip called an armature is activated by an electromagnet. The movement of the armature 
causes the contacts to either open or close, thereby turning a circuit on or off. In some designs the armature 
is a drum that rotates when the magnetic field is activated.

Inspection & Approval Certificates : C/W Certificate (Calibration Works Certificate) EN 10204 3.1 / DIN 50049 3.1 / ISO 10474 3.1 Mill Test Certificate, NACE MR-0103 / NACE MR-0175 / ISO 15156, CE Marked, European Pressure Equipment Directive PED-2014/68/EU, AD-2000-WO, ASME Boiler & Pressure Vessel Code Sec.II Part A Ed. 2015, API 6A (American Petroleum Institute), with 3.2 certificate duly Certified & Approved by LRS (Lloyd's Register), GL (Germanischer Lloyd), BV (Bureau Veritas), DNV (Det Norske Veritas), ABS (American Bureau of Shipping), DNV-GL, SGS, TUV, RINA, IRS, NORSOK Approved Standard M-630, M-650 Rev.3, ROHS Compliant         
 

If you have any requirement of above items, please feel free to contact us

Regards,

CONTACT PERSON :

MUKESH SHAH         
Director          
Mobile No. 0091 - 9820292499          
Email - marketing@rolexmetals.com

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