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Relay modules can be exposed to extreme temperatures from −40 to +70 °C (−40 to 158 °F) in railway applications, depending on the area of application. This is because the control cabinet is sometimes installed in a steel housing below the passenger compartment that is not climate controlled.
As a general rule, depending on the place of installation and heat ratio, the railway industry divides the areas of application for electrical components into four temperature classes, from T1 to TX. Experience has shown that a number of applications fall in class T3, which corresponds to the temperature range from −25 to +70 °C (−13 to 158 °F). All WAGO relay modules for railway applications correspond to the highest classes, T3 or TX.
Loads due to vibration and shock are also significant in railway vehicles. EN 61373 “Railway applications – Rolling stock equipment – Shock and vibration tests” describes the mechanical influences caused by operation in detail.
WAGO’s relay modules meet all requirements for use in railway operations in categories 1A to 1B. Due to the spring-loaded connection, they also offer high shock and vibration resistance.
|Ambient Operating Temperature per EN 50155|
|Temperature Classes||Surrounding Air Temperature outside the Vehicle||Internal Cabinet Temperature||Internal Cabinet Temperature (< 10 min)||Air Temperature on the PCB|
|T1||−25 … +40 °C (−13 ... +104 °F)||−25 … +55 °C (−13 ... +131 °F)||+15 K||−25 … +70 °C|
|T2||−40 … +35 °C (−40 ... +95 °F)||−40 … +55 °C||+15 K||−40 … +70 °C|
|T3||−25 … +45 °C (−13 ... +113 °F)||−25 … +70 °C||+15 K||−25 … +85 °C (−13 ... +185 °F)|
|TX||−40 … +50 °C (−13 ... +122 °F)||−40 … +70 °C||+15 K||−40 … +85 °C (−13 ... +185 °F)|
The integrated protective circuit ensures reliable operation in all applications. The modules handle switching of loads with both inrush and switch-off currents. Causes of high inrush currents include incandescent bulbs with resistive loads and ECGs with capacitive load; causes of burdensome switch-off currents include magnet valves with their inductive coils.
For areas of application with high switching peaks, WAGO has developed optocouplers and solid-state relays with a zero voltage switch. These minimize peaks.
As an interface module between process peripherals, as well as control and signaling equipment, optocouplers and solid-state relays (SSR) impress customers with the following advantages:
Relays and Optocouplers/Solid-State Relays
Rail-Mount Terminal Blocks with Miniature Switching Relay or Optocoupler
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