Relays

Relays are switches that electronically or electromechanically open and close circuits. These devices create magnetic fields in a coil that can manage switches capable of controlling larger currents. Thus, relays can easily switch to a larger current. When this happens, the said circuits are electrically segregated from one another. It works like some sort of an electric lever. Relays have two major functions: turning something on and off (switches) and turning small currents to much larger currents (amplifiers).

Parts of Relays

Relays have four parts:

  1. frame (supports the relay parts),
  2. coil (wire wound on a metal coil, it creates electromagnetic fields),
  3. armature (responsible for closing and opening contacts), and
  4. contacts (the switch’s conducting part).

Types of Relays

There are different sizes and varieties of relays, but the three main types are reed, solid-state, and electromechanical relays.

  • Reed relays are composed of an electromagnetic coil and a reed switch. Placed inside a glass tube containing inert gas are two metal blades or reeds that make up the switch. A closed path is created after current passes through to the coil and the contacts magnetically attract each other. These relays use only small amounts of power but can switch faster compared to larger relays. Their voltage ratings and switching current are quite low, though.
  • Solid-state relays or SSRs are not equipped with any moving component, which means they are highly reliable. Compared to other relays, SSRs have higher power gains. Their required control energy is significantly lower than output power. These fast and small relays are ideal for computer transistors.
  • Electromechanical relays are made of a mechanical movable contact and electromagnetic coil. These relays build a magnetic field once current passes to the coil. This field then attracts the armature or the movable contact. Contacts are retracted when there’s a spring and magnetic field. It disappears when the coils do not have power.

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84873022 from Crouzet
Crouzet

RELAY, 3 PH, SPDT, 183VAC, 528VAC; Product Range:MWG Series; Contact Configuration:SPDT; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250V; Supply Voltage Max:480VAC; Phase Type:3 Phase RoHS Compliant: Yes

84873023 from Crouzet
Crouzet

RELAY, 3 PH, SPDT, 183VAC, 528VAC; Product Range:MWU Series; Contact Configuration:SPDT; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250V; Supply Voltage Max:480VAC; Phase Type:3 Phase RoHS Compliant: Yes

84873024 from Crouzet
Crouzet

RELAY, 3 PH, SPDT, 183VAC, 528VAC; Product Range:MWA Series; Contact Configuration:SPDT; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250V; Supply Voltage Max:480VAC; Phase Type:3 Phase RoHS Compliant: Yes

84873025 from Crouzet
Crouzet

RELAY, 3 PH, SPDT, 183VAC, 528VAC; Product Range:MWUA Series; Contact Configuration:SPDT; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250V; Supply Voltage Max:480VAC; Phase Type:3 Phase RoHS Compliant: Yes

84873026 from Crouzet
Crouzet

RELAY, 3 PH, DPDT, 194VAC, 528VAC; Product Range:HWUA Series; Contact Configuration:DPDT; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250V; Supply Voltage Max:480VAC; Phase Type:3 Phase RoHS Compliant: Yes

84873221 from Crouzet
Crouzet

PHASE MONITORING RELAY, DPDT, 332VAC; Product Range:H3USN Series; Contact Configuration:DPDT; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250V; Supply Voltage Max:277VAC; Carry Current:5ARoHS Compliant: Yes

PWRS220A from Crouzet
Crouzet

PHASE MONITORING RELAY, SPDT, 220VAC; Product Range:WRS Series; Contact Configuration:SPDT; Contact Current:10A; Relay Mounting:Socket; Relay Terminals:Quick Connect; Switching Voltage Max:250VAC; Supply Voltage Max:220VAC RoHS Compliant: No

DPA01CM60 from Carlo Gavazzi
Carlo Gavazzi

RELAY, 3 PH, SPDT, 323VAC, 690VAC; Product Range:DPA01 Series; Contact Configuration:SPDT; Contact Current:8A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250VAC; Supply Voltage Max:600VAC; Carry Current:8A RoHS Compliant: Yes

DPC01DM69 from Carlo Gavazzi
Carlo Gavazzi

RELAY, 3 PH, SPDT, 510VAC, 793VAC; Product Range:DPC01 Series; Contact Configuration:SPDT; Contact Current:8A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250VAC; Supply Voltage Max:690VAC; Carry Current:8A RoHS Compliant: Yes

K8DT-PH1CN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPDT, 480V, DIN; Product Range:K8DT-PH Series; Contact Configuration:SPDT; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250VAC; Supply Voltage Max:480VAC RoHS Compliant: Yes

K8DT-PH1TN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPST, 480V, DIN; Product Range:K8DT-PH Series; Contact Configuration:SPST-NO; Contact Current:-; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:-; Supply Voltage Max:480VAC RoHS Compliant: Yes

K8DT-PM1CN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPDT, 240V, DIN; Product Range:K8DT-PM Series; Contact Configuration:SPDT; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250VAC; Supply Voltage Max:240VAC RoHS Compliant: Yes

K8DT-PM1TN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPST-NO, 240V, DIN; Product Range:K8DT-PM Series; Contact Configuration:SPST-NO; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250VAC; Supply Voltage Max:240VAC RoHS Compliant: Yes

K8DT-PM2CN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPDT, 480V, DIN; Product Range:K8DT-PM Series; Contact Configuration:SPDT; Contact Current:-; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:-; Supply Voltage Max:480VAC RoHS Compliant: Yes

K8DT-PM2TN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPST, 480V, DIN; Product Range:K8DT-PM Series; Contact Configuration:SPST-NO; Contact Current:-; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:-; Supply Voltage Max:480VAC RoHS Compliant: Yes

K8DT-PZ1CN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPDT, 240V, DIN; Product Range:K8DT-PZ Series; Contact Configuration:SPDT; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250VAC; Supply Voltage Max:240VAC RoHS Compliant: Yes

K8DT-PZ1TN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPST-NO, 240V, DIN; Product Range:K8DT-PZ Series; Contact Configuration:SPST-NO; Contact Current:5A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250VAC; Supply Voltage Max:240VAC RoHS Compliant: Yes

K8DT-PZ2CN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPDT, 480V, DIN; Product Range:K8DT-PZ Series; Contact Configuration:SPDT; Contact Current:-; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:-; Supply Voltage Max:480VAC RoHS Compliant: Yes

K8DT-PZ2TN from Omron Industrial Automation
Omron Industrial Automation

PHASE MONITORING RLY, SPST, 480V, DIN; Product Range:K8DT-PZ Series; Contact Configuration:SPST-NO; Contact Current:-; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:-; Supply Voltage Max:480VAC RoHS Compliant: Yes

DWB01CM4810A from Carlo Gavazzi
Carlo Gavazzi

RELAY, 3 PH, SPDT, 480VAC; Product Range:DWB01 Series; Contact Configuration:SPDT; Contact Current:8A; Relay Mounting:DIN Rail; Relay Terminals:Screw; Switching Voltage Max:250VAC; Supply Voltage Max:480VAC; Phase Type:3 Phase RoHS Compliant: Yes

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