Timer relais

TDB4-U200N relay - Timer, delay-on, 4 pole



Plug-in electronic railway timer relay with four change-over contacts for reliable switching of very low currents (1 mA @ 5 VDC) up to currents of 10A @ 110VDC. When the relay is activated there is a delay on pull-in. The delay time is adjustable with a lockable knob. The relay can also be supplied with a fixed time delay (no knob).

The relay is equipped with two LEDs which indicate the presence of power supply and the energizing of the coil.

The built-in magnetic arc blow-out ensures adequate DC breaking capacity resulting in long contact life. The integrated contact separation prevents cross pollution of contacts. On the relay cover the serial number and data matrix code are shown for ease of traceability.

The construction of the relay and choice of materials makes the TDB4-U200N relay suitable to withstand low and high temperatures, shock & vibration and dry to humid environments.

No external retaining clip needed as integrated ‘snap-lock’ will hold relay into socket under all circumstances and mounting orientations.

Compact design, choice of many options and a wide range of sockets makes the TDB4-U200N relay an easy and flexible solution to use.


The TDB4-U200N is used in demanding rolling stock applications where a time delay is necessary after activating the relay. Relays continue to play a vital role in reliable train operation. Key functions are galvanic isolation between control (computers/ PLC’s) and power circuits providing system isolation, contact multiplication and amplification.

Other unique features are:

  • predictable failure behavior (Fail Safe) making system safety validation a lot more simple than using computer based solutions like PLC’s
  • long term availability (no obsolescence)
  • easy maintenance by plug-in feature and transparent cover
  • unlike more sensitive electronics, relays are insensitive to EMI

Using these features one can build a hardwired, fail safe control system which is cyber secure and insensitive to electro magnetic disturbances and surges. Relays are ideal to use in trains for signal transfer/repeat, safety interlocking functions (brake - doors), load on-off switching and sub-system isolation.

Railway compliancy

  • EN 50155 : 2017 Railway applications - Rolling stock - Electronic equipment
  • IEC 60571: 2012 Railway applications - Electronic equipment used on rolling stock
  • IEC 60947-5-1: 2016 / IEC 60947-5-4: 2012 Low-voltage switchgear and controlgear
  • IEC 61373: 2010 Railway applications - Rolling stock equipment - Shock and vibration tests
  • EN 50121-3-2: 2016 Railway applications - Electromagnetic compatibility
  • NF F16-101/102 Railway rolling stock - Fire behavior
  • EN 45545-2: 2015 Railway applications - Fire protection on railway vehicles Part 2: Requirements for fire behavior of materials and components



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Railway rolling stock
Railway signalling