Albright SW80 Series DC Contactors 1

SW80 Series of D.C. Contactors

Magnetic Blowouts 'B'
The single pole types (excluding 'P' versions) can be fitted with permanent magnet blowouts. These enable the contacts to switch D.C. voltages of 48V or higher. Fitting of blowouts makes the contacts polarity sensitive and the Positive markings on the top cover of the contactor must be observed. The suffix 'B' denotes the fitting of magnetic blowouts, e.g. SW80B.

Auxiliary Contacts 'A'
A double circuit normally open, normally closed microswitch can be fitted which has a DC resistive rating of 5 amperes at 24V. The suffix 'A' should be added to the type number when an auxiliary contact is required, e.g. SW80A.
Note: Auxiliary contacts cannot be fitted to the SW82 or SW822 types.

Large Contacts 'L'
The SW80 range of contactors have standard contacts which are 8mm diameter. These are suitable for the majority of applications where switching conditions are relatively light, particularly on electronically controlled vehicles. However, in applications where more severe conditions exist, e.g. pump motor switching, all types are available with larger contacts 10.3mm diameter. The suffix 'L' denotes larger contacts.

Protected Contactors 'P'
All types can be fitted with closed contact housings as a low cost option to provide protection against environment dust. However, special versions of the DC88, DC92, SW80, SW82, SW85 and SW822 contactors are available which are protected to IP66 against particularly adverse environments such as water spray, airborne dust, etc. These contactors, which have the suffix 'P' are sealed in an inert plastic case and are fitted with mounting brackets as shown in the drawings.

Magnetic blowouts cannot be fitted to these types and therefore under normal circumstances the maximum voltage which can be switched by the DC88P, DC92P, SW80P and SW85P is 48V DC although the types SW82P and SW822P, by virtue of their double pole configuration, may be used up to 96V DC.

Auxiliary contacts can be fitted to the SW80P and SW85P but some loss of protection will result.

DC88 and DC92 Contactors
The DC88 is another version of a reversing contactor for DC motors. It has a monoblock construction and it comprises two single pole changeover contactors configured in such a way so that all the necessary links for DC motor reversing applications are contained within the contact housing.

This results in a neat compact design which is compatible with modern electronic control systems. The main terminals can be configured in a variety of ways in order to suit the applicable layout. All the features described here for the other contactors in the SW80 range apply to the DC88. Similarly all the optional extras listed apply:

Magnetic blowouts (suffix B)
Auxiliary contacts (suffix A0
Large contact tips (suffix L)

A variety of methods for mounting the contactor are available:

(1) An integral bracket.
(2) Tapped holes in the contactor frame for direct panel mounting.
(3) Separate brackets for mounting the contactor at 90° to a panel. (see drawing for details).

The DC88E is physically and electrically interchangeable with the SW88 reversing contactor.

Note: A paired single pole On/Off contactor can also be supplied. This is the DC92 and this contactor can also have integral links for the main poles if required.

DC88E and DC92E Economy Contactors
The DC88E is a version of the DC88 Direction Contactor and has a reduced specification compared with the standard DC88. It has been designed for use with smaller pedestrian and rider electric trucks, particularly those equipped with electronic controls. It is also intended for use with small electric winches, cranes, etc.

Thermal current rating is normally 80 Amperes and coil power has been reduced to within the range of 10 to 15 watts compared with the 15 to 20 watts of the standard version. This reduced specification results in lower price which can compare favourably with the price of automotive canned solenoids together with their associated wiring and mounting costs.

Similarly the DC92E Economy Version of the DC92 paired On/Off contactor is also available. Most of the additional features which can be specified on the standard DC88 and DC92, such as magnetic blowouts, auxiliary contacts, dust shields, etc, can also be specified for the DC88E and DC92E. Similarly, overall dimensions, footprint and terminal sizes are unchanged.