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Relays

The relays represent the most important category of devices in a protection and automatic control instalation. The relays are switching devices equiped with one or more contacts, driven by an electrical signal. Used to switch a high voltage value of the current into a smaller one, the relays are formed by a coil, one or more contacts and a spring mechanism

       

       

Description:


The relays represent the most important category of devices in a protection and automatic control instalation. The relays are switching devices equiped with one or more contacts, driven by an electrical signal. Used to switch a high voltage value of the current into a smaller one, the relays are formed by a coil, one or more contacts and a spring mechanism.

After construction and operating principle, the relays are divided into:

  • Electrodynamic
  • Electromagnetic
  • Magnetoelectric
  • Magnetic

After nature of the inputs, the relays are divided into:

  • Of current
  • Of voltage
  • Of power
  • Of phase shift
  • Of frequency
  • Of impedance

After the nature of variations of inputs, the relays are divided into:


  • Maximal
  • Minimal
  • Differential
  • Directional
  • Power

Specifications:

  • Nominal coil voltage: 12V, 24V DC
  • Maximum voltage on contacts: 30A, 100A
  • Operating temperature: from -40 to +85 degrees Celsius
  • Can be mounted on panels
  • Coil resistance: 115.2Ω, 180Ω
  • Maximal switched voltage: 16V, 400V DC
  • Power selection throught coil: 5W, 800mW
  • Load on contacts: 60 A / 400 VDC
  • Pin resistance: 30mΩ
  • Drive time: 50ms
  • Download time: 30ms
  • Current on coil: 208mA
  • Minimum voltage on coil: 6.5V DC
  • Insulation voltage: 400V
  • Overvoltage protection on the pair of contacts: 2.5kV
  • Protection degree: IP20
  • Power supply indicator: green LED

Applications:

  • Engine, transformer, generator protection
  • Automotive industry etc

Strengths:

  • Extremely versatile
  • Very simple to use

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