DC Contactors, Electromechanical : 1400 Contactors

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Features

• Silver/cadmium oxide tips are highly resistant to wear and provide inherent protection against contact welding.
• Negligible contact bounce and positive wiping action of the contact permit a high current-making capability for a contactor of its size.
• The complete normally-open contactor users only four fasteners (five on the changeover type) - all of them self-locking - which greatly facilitates assembly and maintenance. The contactor is attached to an insulating base which permits mounting directly onto the vehicle chassis.
• The contactor may be removed from the base panel by slackening a single fastener.
• Absence of adjustable components eliminates any chance maladjustment by the user.
• Blow-out magnets housed in arc-resistant mouldings are supplied as standard and permit high current rupturing capability.
• The coil is sealed to give protection against moisture and shock. The coil may be rotated through 180° to locate the faston connectors in the most convenient position for the user.
• The location of the heavy-current terminals permits exceptionally close packaging to be achieved without restricting access to individual contactors.

Options

• Choice of diode networks for suppression of the coil circuit.
• A microswitch for controlling auxiliary circuits may be fitted to either side of the contactor. The microswitch will handle five amps (resistive).
• Cableform's range of modules for time delays on the make or break operation, may be used with this contactor.

Connections

1. Heavy current connections are by M8 fasteners. The normally open contacts being fitted with standard magnetic blowouts, the load must be connected in the correct polarity, the positive connection to the fixed contact.
2. Connections to the coil and to the auxiliary switches are by 6.35mm fastons. ('amp' 'positive lock' type are recommended).

Mounting

A 6.7mm hole is located in each corner of the base panel. Fixing by either pair of diagonally-opposite holes is adequate.

It is recommended that the contactor be mounted with its base panel in the vertical plane. Because the terminals of the normally-open contacts are symmetrically disposed relative to the base panel, orientation may be with the normally-open contacts located in either the uppermost position or the lowermost position. This is important where several sets of contacts are to be connected in series, since it permits the interconnections to be made with short straight links, while keeping all the fixed contacts on the positive side of the current path. This eliminates the need for either reverse-polarity blowouts or for long interconnections, and it also permits maximum packing density to be achieved.

Installation

All dimensions in millimeters.

Performance Specification

Model 1421 - Single Pole Normally-open

Model 1422 - Single Pole Changeover