Electromechanical Relays Specifications | Engineering360

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Relay Type


	Relay Type
	Your choices are...
	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


	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


	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


	Normally Open (NO)		With normally open (NO) devices, the relay contact pair is open when the coil is not energized.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	Normally Closed (NC)		With normally closed (NC) devices, the relay contact pair is closed when the coil is not energized.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	Changeover (CO)		Changeover relays typically have one set of Form C contacts and are single-pole, double-throw (SPDT) devices.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

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Contact Ratings


	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.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	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).
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	Maximum DC Switching Power		The maximum DC switching power is measured in watts (W).
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

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Coil Ratings


	AC Coil Voltage		This is the AC voltage rating of the relay actuation coil.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	DC Coil Voltage		This is the DC voltage rating of the relay actuation coil.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Coil Resistance		The resistance of the actuation coil is measured in ohms (Ω).
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Coil Nominal AC Power		Coil nominal AC power is measured in volt amperes (VA).
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	Coil Nominal DC Power		Coil nominal DC power is measured in watts (W).
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

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Performance


	Make Time (Operate Time)		Make time (operate time, pick-up time) is the time required from actuation to the full current-carrying state.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

	Break Time (Release Time)		Break time (release time, drop-out time) is the time from deactivation to the open state.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

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Features


	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


	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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