Electrical Contacts

French Version

German Version

Electrical Contacts

PRODUCTS & SERVICES | METAL-JOINING PRODUCTS | ENGINEERING MATERIALS

The Electrical Contacts range of Mallory products, based primarily on silver, to four principle areas of application:

CONTACTORS

The manufacture of contactors requires the use of contact materials that combine high electrical and thermal conductivity with good resistance to welding and wear. The Mallory DX series of silver-cadmium oxide materials fulfills all these requirements.

The Mallory DN series of silver-nickel products is suitable for lighter duty contactor applications.

CIRCUIT BREAKERS

Safe and reliable switching of the very high currents encountered in industrial circuit breakers requires the use of materials which are extremely resistant to arc erosion and welding. Tungsten, with a melting point in excess of 3,300^ºC, provides the basis for the Mallory RS range of silver-tungsten materials designed to handle such demanding applications. The Mallory RG series of silver-tungsten carbide materials gives circuit breakers improved stability of contact resistance without significantly compromising resistance to arcing and welding. These materials can also be used in applications where temperature rise under load must be minimised.

The Mallory RW series of copper-tungsten products offers the customer maximum economy whilst retaining good conductivity and resistance to arcing within the circuit breaker. These products are typically operated in a protective environment as in SF6 or oil-immersed circuit breakers.

MINIATURE CIRCUIT BREAKERS

The Mallory DF series of directional silver-graphite materials provides maximum resistance to contact welding on make, which is particularly attractive in current-limiting MCBs.

The Mallory RS series of silver-tungsten materials is widely used in more traditional MCBs.

EARTH LEAKAGE CIRCUIT BREAKERS

The Mallory DX range of contact materials provides the user with an unsurpassed combination of high conductivity and resistance to both welding and erosion over a wide range of operating conditions.

Most ELCB designers specify the Mallory DX series of silver-cadmium oxide materials because of their anti-weld characteristics. These materials contain a minimum of 85% silver by weight.

Product	Series	Nominal Composition	*Elec1**	Therm*2	Hardness	Applications
Elkanite 1W3 Elkanite 3W3 Elkanite 5W3 Elkanite 10W3 Elkanite 30W3	RW	60% W-Cu 68% W-Cu 70% W-Cu 72% W-Cu 78% W-Cu	41 33 31 30 28	0.44 0.38 0.37 0.36 0.32	77 HRB 84 HRB 87 HRB 90 HRB 99 HRB	Immersed Circuit Breakers
Elkanite 20S Elkanite 35S Elkanite 50S	RS	27% Ag-W 35% Ag-W 50% Ag-W	43 52 61	0.46 0.56 0.66	97 HRB 91 HRB 70 HRB	Miniature Circuit Breakers. Air Circuit Breakers.
Elkanite G12 Elkanite G13 Elkanite G14	RG	60% Ag-WC 50% Ag-WC 40% Ag-WC	68 57 36	0.77 0.64 0.42	33 HRB 83 HRB 93 HRB	Traditional Miniature Circuit Breakers.
Elkanite D54 Elkanite D55 Elkanite D54X Elkanite D55X	DX	90% Ag-CdO 85% Ag-CdO 90% Ag-CdO 85% Ag-CdO	84 72 84 77	0.88 0.82 0.88 0.85	50 HV 50 HV 55 HV 62 HV	Contactors. Earth Leakage & Miniature Circuit Breakers.
Elkanite D58-1% Elkanite D58-2% Elkanite D58-5%	DF	99% Ag-C 98% Ag-C 95% Ag-C	96 86 55	0.95 0.89 0.57	40 HV 40 HV 35 HV	Slip Rings. Modern Miniature Circuit Breakers.
Elkanite D510 Elkanite D520 Elkanite D56	DN	90% Ag-Ni 80% Ag-Ni 70% Ag-Ni	87 82 72	0.87 0.85 0.74	40 HV 48 HV 68 HV	Contactors. Medium Dry Switches.

*1 - Electrical Conductivity (%IACS)
*2 - Thermal Conductivity (egs)

All Mallory Alloys Group products conform to, if not exceed, the relevant standards as assured by the Quality Management System

Quality Management System - ISO 9002, EN 29002, BS5750-2