ISO INTERNATIONAL STANDARD 4400 Third edition 1994-09-01 Fluid power systems and components Three-pin electrical plug connectors with earth contact - Characteristics and requirements Transmissions hydrauliques et pneumatiques - Connecteurs electriques a trois broches avec contact de securite - Caracteristiques et exigences ISO Reference number ISO4400:1994(El ISO 4400:1994(E) Foreword ISO(theInternationalOrganization forStandardization)is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through isO technical committees. Each member body interested inasubject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with isO, also take part in the work. iSO collaboratesclosely with theInternational Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting avote. InternationalStandardISO44oowaspreparedbyTechnicalCommittee ISO/TC 131,Fluid power systems, Subcommittee SC 5, Control products and components. This third edition cancels and replaces the second editio n (IsO 4400 :1985), of which it constitutes a technical revision. In particular, peratures of use has beenmodified. 0ISO1994 All rights reserved. Unless otherwise specified,(IO part of this publication may be reproduced microfilm, without permissionin writing from the publisher. International OrganizationforStandardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii o ISO ISO 4400:1994(E) Introduction In fluid power systems, power is transmitted and controlled through a fluid under pressure within an enclosed circuit. Typical components found in such systems are hydraulic and pneumatic controls. These devices are used to regulate the function of a component or system. Some control components found in fluid power systems are electrically actuated. The electrical plug, connector described in this International Standard is used with control and regulation assemblies for use in hy- draulic and pneumatic fluid power systems. ili