Wa0009.
Wa0009.
Wa0009.
Contacts – The contacts are the most important part of the relay
that affects the reliability. The good contact gives limited contact
resistance and reduced contact wear. The selection of the contact
material depends upon the several factors like nature of the current
to be interrupted, the magnitude of the current to be interrupted,
frequency and voltage of operation.
1. Coil Specifications
Coil Voltage: The voltage required to energize the coil, commonly available
in AC (e.g., 6V, 12V, 24V, 120V, 240V) and DC (e.g., 5V, 12V, 24V).
Coil Resistance: The resistance of the coil, affecting the current drawn
when energized.
Coil Power Consumption: The power consumed by the coil when energized,
typically measured in watts.
2. Contact Specifications
Size and Mounting: Dimensions and mounting style (e.g., PCB mount, DIN
rail mount).
Enclosure Type: Open, sealed, or weatherproof enclosures for
environmental protection.
4. Performance Specifications
Switching Time: The time it takes for the relay to switch from one state
to another.
Life Expectancy: The expected number of operations (mechanical and
electrical life).
Dielectric Strength: The voltage that the relay can withstand between the
contacts and the coil without breakdown.
5. Environmental Specifications
1.electromechanical relays
2.solid state relays
3.magnetic latching relays
4.thermal relays
5.reed relays
6.differential relays
7.distance relays
8.electromagnetic relay
1. Electromechanical relays
Magnetic Latching relays can have either single or dual coils. On a single
coil device, the relay will operate in one direction when power is applied
with one polarity, and will reset when the polarity is reversed. On a dual
coil device, when polarized voltage is applied to the reset coil the
contacts will transition.
4.Thermal relays
6. Distance relays
Manufacturing companies
1. Siemens
2. ABB.Ltd
3. Schneider electric
4. Adlite Electricals
5. LEELAVATI AUTOMATION PVT.LTD
6. Larsen and Toubro limited
7. H.K.Electric co
Application
Advantages
Disadvantages