Latching Relay
Electromechanical relay that retains the selected switching state after the control action is removed.
A latching relay is intended to switch between stable states while retaining the selected position without continuously energizing the control coil.
Switching may be performed by one bistable coil or by separate SET and RESET windings.
Separate coils may have individual rated voltages, currents, resistances, and power values. Reliable switching requires consideration of minimum SET and RESET pulse duration, maximum operate voltage, and transition times between states.
If the SET and RESET windings are electrically isolated, dielectric test voltage between them may be specified.
The contact system may contain normally open, normally closed, and changeover contacts and retain the corresponding position after the control signal disappears.
Such relays are used in state-memory circuits, lighting control, automation, energy-efficient systems, and other applications requiring state retention without continuous coil power.
Selection criteria include coil configuration, control-pulse parameters, number of stable states, contact configuration, load characteristics, and electrical endurance.
This subcategory includes latching electromechanical relays with one or more control windings and a retained switching state.
Latching Relay
General6
Commercial or technical designation of a manufacturer's product family sharing a common design and compatible characteristics.
Range of tasks and systems for which the manufacturer recommends the component.
Primary function of the device and its intended use as defined by its design and the manufacturer's documentation.
Permissible installation location of the product: indoors, outdoors, in a technical area, or as part of equipment.
Environmental conditions under which installation and operation of the product are permitted.
Permissible spatial orientation of the component during installation and operation.
Dimensions3
External horizontal dimension of the product between its outermost lateral points.
External vertical dimension of the product from its lowest to its highest point.
External distance between the foremost and rearmost surfaces of the product.
Capacity and Layout8
Number of independent relay outputs or sets of switching contacts provided by the product.
Contact configurations provided for the product relay outputs.
Number of normally open switching contact sets provided by the relay.
Number of normally closed switching contact sets provided by the relay.
Number of changeover contact sets provided by the relay.
Number of stable switching states that can be maintained by the device without a continuous control command.
Winding configuration used for electrically setting and resetting a latching relay.
Maximum number of illuminated control push buttons permitted on the relay control circuit under the manufacturer-declared leakage-current conditions.
Materials and Finish3
Primary material from which the product is manufactured.
Grade, alloy, class, or technical designation of the product's primary material.
Electrical contact material or contact-material system used by the relay switching contacts.
Mounting and Installation5
Profile type of the DIN rail installed in the product or specified for compatible mounting.
Installation arrangement permitted by the product design, such as wall-mounted, flush-mounted, floor-mounted, or another specified mounting type.
Method used to mechanically secure the product to a support, surface, or load-bearing structure.
Indicates whether the design provides for mounting equipment on a DIN rail.
Indicates whether equipment may be mounted directly to the mounting surface without an intermediate DIN rail.
Electrical Parameters66
Voltage applied to the control circuit to perform the product's intended functions.
Type of current used in the product's control circuit.
Frequency of the alternating voltage or signal in the product's control circuit.
Voltage with reference to which the product's insulation clearances and dielectric properties are specified.
Peak value of an impulse voltage of specified waveform that the product insulation must withstand without breakdown.
Test voltage applied to verify the dielectric strength of the product insulation.
Minimum permissible insulation resistance between the specified electrically separated parts.
Category characterizing the expected level of impulse overvoltages at the product's point of use.
Degree of pollution of the surrounding microenvironment considered when selecting insulation distances and product characteristics.
Type of electrical insulation used, considered in terms of its protective function and construction.
Class of protection against electric shock determined by the product design and protective connection method.
Declared number of mechanical operating cycles that the product can perform without electrical switching load.
Declared number of electrical load-switching cycles under the conditions specified by the manufacturer.
Maximum manufacturer-declared voltage that may be switched by the relay-output contacts.
Maximum manufacturer-declared current that may be switched by the relay-output contacts.
Maximum manufacturer-declared active power that may be switched by the relay-output contacts.
Minimum control-circuit supply voltage supported by the product or electronic coil.
Maximum control-circuit supply voltage supported by the product or electronic coil.
Minimum AC control-circuit frequency supported by the electromagnetic or electronic coil.
Maximum AC control-circuit frequency supported by the electromagnetic or electronic coil.
Operating principle of the relay drive with respect to retention or reset of the switching state.
Indicates whether correct polarity of the DC coil or electronic relay input must be observed.
Manufacturer-declared DC resistance of the relay coil at the stated reference temperature.
Manufacturer-declared tolerance of the relay coil resistance.
Nominal power consumption of the relay coil or electromagnetic drive at rated control voltage.
Nominal current consumed by the relay coil at its rated control voltage.
Maximum pick-up or must-operate voltage expressed as a percentage of the rated coil or control voltage.
Manufacturer-declared time from application of the control signal until the relay reaches its operated switching state.
Manufacturer-declared time from removal of the control signal until the relay returns to its released switching state.
Manufacturer-declared duration of mechanical contact bounce following relay contact operation.
Minimum manufacturer-declared switching voltage for reliable operation of the relay contact.
Minimum manufacturer-declared switching current for reliable relay-contact operation.
Maximum continuous current permitted through a closed relay contact under the manufacturer-declared conditions.
Maximum short-duration inrush current permitted through the relay switching contact.
Maximum AC switching voltage of the relay output contact.
Maximum DC switching voltage of the relay output contact.
Maximum manufacturer-declared AC switching capacity of the relay contacts expressed as apparent power.
Manufacturer-declared electrical resistance of a closed relay switching contact under the specified measurement condition.
Dielectric test voltage applied between the relay coil or control-input circuit and the switching-contact circuit.
Dielectric test voltage applied between electrically isolated relay contact circuits or contact sets.
Rated voltage of the coil or winding used to place a latching relay into the SET state.
Rated voltage of the coil or winding used to return a latching relay to the RESET state.
Rated current of the SET coil at the manufacturer-declared rated voltage.
Rated current of the RESET coil at the manufacturer-declared rated voltage.
Manufacturer-declared electrical resistance of the SET coil at the stated reference temperature.
Manufacturer-declared electrical resistance of the RESET coil at the stated reference temperature.
Nominal active or DC power consumption of the SET coil where separately specified by the manufacturer.
Nominal active or DC power consumption of the RESET coil where separately specified by the manufacturer.
Maximum SET voltage required for operation, expressed as a percentage of the rated SET-coil voltage.
Maximum RESET voltage required for operation, expressed as a percentage of the rated RESET-coil voltage.
Manufacturer-declared time from application of a valid SET command until the relay reaches the SET switching state.
Manufacturer-declared time from application of a valid RESET command until the relay reaches the RESET switching state.
Minimum duration of the SET control pulse required for reliable latching operation.
Minimum duration of the RESET control pulse required for reliable reset operation.
Minimum duration of a general toggle or step control pulse accepted by an impulse or bistable relay.
Maximum duration of a control signal or pulse permitted by the relay manufacturer.
Indicates that a continuous or prolonged control signal may be applied without violating the manufacturer-declared operating conditions.
Indicates that the control input is suitable for operation with illuminated push buttons having a manufacturer-limited leakage current.
Maximum permitted leakage current per illuminated push button or equivalent control device. UI may display the value in mA.
Manufacturer-declared dielectric test voltage between electrically separate SET and RESET windings of a latching relay.
IEC 61810 contact-load categories for which the relay contact characteristics or endurance are declared.
Electrical load types for which switching capability or endurance is explicitly declared by the manufacturer.
Manufacturer-declared relay coil inductance with the armature in the operated or energized position.
Manufacturer-declared relay coil inductance with the armature in the released or de-energized position.
Maximum continuous or manufacturer-permitted coil voltage expressed as a percentage of rated coil voltage under the specified conditions.
Physical terminal or lead execution provided directly on the relay body, distinct from the connection technology of a separate relay socket.
Protection and Safety8
Indicates whether the product material is classified as halogen-free according to the characteristics declared by the manufacturer.
Degree of enclosure protection against access to hazardous parts and ingress of solid objects and water, designated by the IP code.
Class of enclosure resistance to external mechanical impacts designated by the IK code.
Method or level of protection of the user against direct contact with hazardous live parts.
Indicates whether the design prevents finger access to hazardous live parts in the intended condition.
Indicates whether the design provides protection against accidental contact with hazardous live parts.
Classification of a material according to its ability to ignite, sustain combustion, and cease burning under a specified test.
Temperature of the heated wire used when testing the material or product against an ignition source.
Environmental Conditions18
Minimum ambient temperature at which normal operation of the product is permitted.
Maximum ambient temperature at which normal operation of the product is permitted.
Maximum permissible average ambient temperature over a consecutive 24-hour period.
Minimum ambient temperature permitted during storage of the product while not in operation.
Maximum ambient temperature permitted during storage of the product while not in operation.
Minimum ambient temperature permitted during transportation of the product.
Maximum ambient temperature permitted during transportation of the product.
Indicates whether permissible electrical or thermal loading must be reduced as temperature changes.
Temperature above which the permissible product load must be reduced.
Indicates whether the manufacturer has published the relationship between permissible product load and temperature.
Minimum relative air humidity permitted for the declared operating or test condition.
Maximum relative air humidity permitted for the declared operating or test condition.
Indicates whether the permissible humidity value applies only to non-condensing conditions.
Maximum altitude above sea level at which the product may be installed without exceeding the declared conditions.
Indicates whether the permissible product load must be reduced as installation altitude increases.
Altitude above sea level above which the permissible product load must be reduced.
Indicates whether the product's resistance to vibration has been verified under the declared conditions.
Indicates whether the product's resistance to short-duration mechanical shocks has been verified.
Included Equipment1
Indicates whether documentation is included in the product's standard supply.
Special Features13
Indicates whether the product has a local visual or mechanical indicator of operating, fault, or end-of-life status.
Types of local visual or mechanical status indication provided by the product design.
Indicates that suppression of the switching overvoltage generated by the control coil is integrated into the product.
Electrical suppression technology integrated in or explicitly supplied with the contactor control coil.
Indicates that the contactor provides a local manual override mechanism in addition to electrical coil operation.
Mechanical structure of an individual switching contact system, for example single, double or bifurcated contact.
Indicates that a local indicator shows the presence of relay control or input voltage.
Indicates that the relay maintains its last switching state after removal or loss of control power.
Control command types supported for changing or explicitly setting the retained switching state.
Indicates that the product supports a central control command or function affecting one or more controlled channels, outputs or loads.
Indicates support for an explicit central command that forces or sets the relay to the ON state.
Indicates support for an explicit central command that forces or resets the relay to the OFF state.
Number or arrangement of electrical contact gaps opened within one switched current path, such as single-break or double-break construction.
Standards and Compliance25
Regions or markets for which the manufacturer declares regulatory or certification compliance of the product.
Certification, market-approval, or conformity marks applicable to the product.
Primary normative document or standard according to which the manufacturer classifies or assesses the product.
Additional normative documents and standards declared by the manufacturer as applicable to the product.
Indicates whether an official declaration of conformity is available for the product.
Indicates whether a certificate relating to the declared certification or conformity of the product is available.
Identification number of the certificate relating to the product or its certified version.
Name of the organization that issued the certificate or performed the relevant conformity assessment.
Indicates whether the product was tested by an organization independent of the manufacturer.
Indicates whether the CE marking is applied to the product where applicable.
Indicates whether the UKCA marking is applied to the product where applicable.
Indicates whether the EAC marking is applied to the product where applicable.
Indicates whether the product has a declared UL Listed certification or recognition status.
Indicates whether the product has a declared UL Recognized certification or recognition status.
Indicates whether the cULus mark is applied to the product where applicable.
Indicates whether the product has a declared CSA certification or recognition status.
Indicates whether the product has a declared TÜV certification or recognition status.
Indicates whether the product has a declared VDE certification or recognition status.
Indicates whether product compliance with applicable RoHS restrictions on hazardous substances has been declared.
Indicates whether the manufacturer declares compliance of the product with applicable REACH Regulation requirements.
Indicates whether the product falls within the scope of WEEE requirements for waste electrical and electronic equipment.
Compliance with applicable IEC 61810-1 general and safety requirements for electromechanical elementary relays.
Compliance with IEC 61810-2 requirements applicable to reliability evaluation of electromechanical elementary relays.
Compliance with applicable IEC 61810-7 test and measurement procedures for electromechanical elementary relays.
Compliance with UL 61810-1 requirements for electromechanical elementary relays.
Logistics10
Mass of the product itself, excluding transport packaging, additional accessories, and external equipment.
Mass of the product together with its individual packaging and the accessories included in it.
External horizontal dimension of the product's individual package.
External vertical dimension of the product's individual package.
External depth dimension of the product's individual package.
Design type of the product's individual or transport packaging.
Number of individual products contained in one packaging unit at the specified level.
Country of origin of the goods declared for customs or commercial purposes.
Commodity code under the international Harmonized Commodity Description and Coding System.
Commodity code under the Combined Nomenclature of the European Union.