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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