Help with Electromechanical Relays specifications:
Relay Type
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Relay Type | |||
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Aerospace / MIL-SPEC Relay | Relays comply with aerospace or U.S. military specifications (MIL-SPEC). | ||
General Application Relay | Relays are designed for general-purpose applications. | ||
High Voltage Relay | High-voltage relays transfer power in high-voltage and high-frequency applications. They are heavily insulated and consist of strong materials to increase contact life. | ||
Machine Control (Heavy Duty) Relay | Machine-control relays are heavy duty devices that control starters and other industrial components. | ||
Latching Relay | Relays are used for latching applications (e.g. latching limit controllers). | ||
Reed Relay | Reed relays can switch devices, such as solenoids, contactors, and starter motors. | ||
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General Specifications
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Mounting | |||
Your choices are... | |||
Bracket (Flange) Mount | The relay is equipped with a flange. Typically, this flange is installed by bolting the unit to a matching flange that is welded to a corresponding wall. | ||
DIN Rail | The relay is equipped with a fastener that can attach to a DIN rail. | ||
Panel | The relay can be mounted in or on a panel. | ||
PC Board | The relay can be mounted on a printed circuit board (PCB). | ||
Socket or Plug-in Style | The relay can be mounted in a socket or on a printed circuit board (PCB). | ||
Other | Other unlisted mounting styles. | ||
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Additional Specs
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Pole Specifications | |||
Your choices are... | |||
Single Pole (SP) | Single pole (SP) relays have a single, moveable lever with a contact at the end. | ||
Double Pole (DP) | Double pole (DP) relays consist of two, single-pole contacts that are concurrently actuated by the same mechanical system and operation. Typically, the first line is hot and the second is neutral. | ||
Triple Pole (TP) | Triple pole (TP) relays consist of three single-pole contact systems. | ||
Four Pole (4P) | Relays with more than three poles are indicated by the number of single-pole contacts followed by the letter "P". For example, four-pole relays are 4P devices. | ||
> 4 Poles | This category includes relays with more than four circuit contacts. | ||
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Throw Specifications | |||
Your choices are... | |||
Single Throw | Single throw (ST) relays have a pair of contacts that are open in one position and closed in the other. | ||
Double Throw | Double throw (DT) relays have three contacts. In one position, the first is in contact with the second, but not the third. In the other relay position, the connection is reversed. | ||
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Number of Contacts
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Normally Open (NO) | With normally open (NO) devices, the relay contact pair is open when the coil is not energized. | ||
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Normally Closed (NC) | With normally closed (NC) devices, the relay contact pair is closed when the coil is not energized. | ||
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Changeover (CO) | Changeover relays typically have one set of Form C contacts and are single-pole, double-throw (SPDT) devices. | ||
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Contact Ratings
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Maximum Current | This is the maximum continuous current allowable across the relay output terminals under the specified heat dissipation and ambient temperature conditions. Generally, AC current is specified in RMS units. Maximum current is also known as the maximum switching voltage range, or the maximum switching current. | ||
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Maximum AC Switching Voltage | This is the maximum AC switching voltage. | ||
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Maximum DC Switching Voltage | This is the maximum DC switching voltage. | ||
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Maximum AC Switching Power | The maximum AC switching power is measured in volt amperes (VA). | ||
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Maximum DC Switching Power | The maximum DC switching power is measured in watts (W). | ||
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Coil Ratings
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AC Coil Voltage | This is the AC voltage rating of the relay actuation coil. | ||
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DC Coil Voltage | This is the DC voltage rating of the relay actuation coil. | ||
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Coil Resistance | The resistance of the actuation coil is measured in ohms (Ω). | ||
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Coil Nominal AC Power | Coil nominal AC power is measured in volt amperes (VA). | ||
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Coil Nominal DC Power | Coil nominal DC power is measured in watts (W). | ||
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Performance
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Make Time (Operate Time) | Make time (operate time, pick-up time) is the time required from actuation to the full current-carrying state. | ||
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Break Time (Release Time) | Break time (release time, drop-out time) is the time from deactivation to the open state. | ||
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Features
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Features | |||
Your choices are... | |||
Convertible Contacts | Convertible contacts can be reconfigured from normally open (NC) to normally closed (NC), and vice versa. | ||
Current Sensitive | Current sensitive relays indicate when a preset AC or DC current threshold is exceeded. | ||
Expandable Deck | Adder or expandable decks allow the addition of poles to the relay configuration. | ||
Intrinsically Safe | Intrinsically safe (IS) devices will not produce sparks or thermal effects under normal or abnormal conditions, which could ignite a specified gas mixture. | ||
Poly-Phase Relay | Relays are used for switching poly-phase power. | ||
Push-to-Test Button | Push-to-test buttons allow the manual actuation of contacts for circuit testing. | ||
Sealed Relay | Relays are sealed to prevent the ingress of contaminants, water, etc. | ||
Time Delay | Relays provide time delay on make, time delay on break, single shot, recycling, and interval timing functions. | ||
Visual Indicator | The relay has visual indicator such as a light-emitting diode (LED). | ||
Voltage Sensitive | Voltage-sensitive devices detect abnormal conditions on the line side of the relay. | ||
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Environment
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Operating Temperature | This is the full-required range of ambient operating temperature. This represents the surrounding air temperature limits. | ||
Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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