Auxiliary Contact
Additional contact module for transmitting device status to external control, indication and automation circuits.
An auxiliary contact is fitted to a compatible switching or protective device and is mechanically linked to its main operating mechanism.
It is used to transmit device status to PLCs, relay circuits, indication systems, interlocks and supervisory systems.
The contact function depends on the design: it may reproduce the position of the main contacts, the operating mechanism state or another mechanical condition.
Selection criteria include the number of NO/NC contacts, control-circuit electrical ratings, the indication function and the permitted mounting position on the host device.
Auxiliary contacts for circuit breakers, switches, contactors and other switching devices.
Auxiliary Contact
General3
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.
Dimensions4
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.
Mass of the product itself, excluding transport packaging, additional accessories, and external equipment.
Capacity and Layout5
Device state, mechanism state or event represented by an auxiliary, signal or alarm contact.
Total number of electrical connection points provided by the product.
Number of normally open (NO) auxiliary contacts installed in or supplied with the product.
Number of normally closed (NC) auxiliary contacts installed in or supplied with the product.
Number of changeover auxiliary contacts installed in or supplied with the product.
Materials and Finish4
Primary material from which the product is manufactured.
Electrical contact material used for auxiliary switching contacts.
Primary visually perceived colour of the product's external surface.
Type of final surface finish of the product determining its appearance and service properties.
Mounting and Installation4
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.
Permissible spatial orientation of the component during installation and operation.
Position of the accessory relative to the host switching or protective device, independent of the general installation orientation.
Electrical Parameters29
Maximum manufacturer-declared operational voltage Ue of the auxiliary contact circuit.
Rated insulation voltage Ui specifically declared for the auxiliary contact circuit.
Rated impulse withstand voltage Uimp specifically declared for the auxiliary contact circuit.
Minimum AC frequency applicable to the declared auxiliary-contact electrical ratings.
Maximum AC frequency applicable to the declared auxiliary-contact electrical ratings.
Conventional free-air thermal current Ith specifically declared for the auxiliary contacts.
Rated operational current Ie of the auxiliary contacts for utilization category AC-15 at the associated reference voltage.
Operational voltage associated with the stored AC-15 auxiliary-contact rated current.
Rated operational current Ie of the auxiliary contacts for utilization category DC-13 at the associated reference voltage.
Operational voltage associated with the stored DC-13 auxiliary-contact rated current.
Minimum switching voltage for which the manufacturer declares reliable auxiliary-contact operation.
Minimum switching current for which the manufacturer declares reliable auxiliary-contact operation.
Manufacturer-declared non-overlapping time between opening and closing of associated NO and NC auxiliary contacts.
Maximum manufacturer-declared electrical switching frequency of the auxiliary contacts under AC-15 conditions.
Maximum manufacturer-declared electrical switching frequency of the auxiliary contacts under DC-13 conditions.
Manufacturer-declared short-time withstand current of the auxiliary circuit for a duration of 1 second.
Manufacturer-declared short-time withstand current of the auxiliary circuit for a duration of 0.1 second.
Manufacturer-declared power dissipation per auxiliary-contact pole at the stated reference current.
Manufacturer-declared duration of mechanical contact bounce following relay contact operation.
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.
Conductor connection methods supported by the specified terminals or connection elements.
Minimum conductor cross-section permitted by the connection system within its general conductor-size range.
Maximum conductor cross-section permitted by the connection system within its general conductor-size range.
Conductor materials for which the specified terminals and connection methods are designed.
Conductor construction classes permitted by the product's electrical connection system.
Tightening torque specified by the manufacturer for a screw or bolted terminal connection.
Minimum conductor stripping length specified by the manufacturer.
Maximum conductor stripping length specified by the manufacturer.
Protection and Safety4
Degree of enclosure protection against access to hazardous parts and ingress of solid objects and water, designated by the IP 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.
Environmental Conditions5
Minimum ambient temperature at which normal operation of the product is permitted.
Maximum ambient temperature at which normal operation of the product is permitted.
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.
Maximum relative air humidity permitted for the declared operating or test condition.
Special Features4
Indicates that the applicable auxiliary contact elements are manufacturer-declared mechanically linked contacts.
Indicates that one or more normally closed auxiliary contacts are manufacturer-declared mirror contacts relative to the main normally open contacts.
Number of normally closed auxiliary contacts declared by the manufacturer as mirror contacts.
Switching sequence between associated NO and NC auxiliary contacts.
Standards and Compliance7
Indicates whether the CE marking is applied to the product where applicable.
Compliance with applicable IEC 60947-5-1 requirements for control-circuit devices and switching elements.
Indicates whether the product has a declared UL Listed certification or recognition status.
Indicates whether the product has a declared CSA 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 declared compliance of the product with the applicable general requirements of IEC 60947-1 for low-voltage switchgear and controlgear.