Configuration and Construction

Mechanical relays Selection Guide

1. Protective Construction

Dust Cover Type

To protect from dust, these types are covered, for example, with a plastic case. We recommend hand soldering, because these relays are not constructed to prevent flux and cleaning fluid from entering during automatic soldering.

Flux-Resistant Type

The relay is constructed so that flux will not enter inside the relay during automatic soldering. However, cleaning is not possible.

Sealed Type

Construction is designed to prevent seeping of flux when soldering and cleaning fluid when cleaning. Designed for minimal release of harmful gas at the contacts.

Sealed capsule type

This type is hermetically sealed with ceramic and metal plating. No harmful gas or humidity will ever reach the contacts. This type cannot be washed.

2. Construction and Characteristics

Type Construction


Harmful Gas
Dust Cover Type Most basic construction where the case and base (or body) are fitted together. Caution No Caution No
Flux-Resistant Type Terminals are sealed or molded simultaneously. The joint between the case and base is higher than the surface of the PC board. Yes No Caution No
Terminals, case and base are filled with sealing resin.
Construction is not hermetically sealed.
Yes No Caution No
Sealed Type Sealed construction including terminals and case. The base is sealed with sealing resin. Yes Yes Yes Yes
Sealed Capsule Type (EP and EV relays only) Hermetically sealed construction by sealing the metal case and plate, and the terminal and ceramic part, with solder. No No Yes Yes

Since the plastic material is porous, please avoid atmospheric exposure to silicon..

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3. Operational Function

Single Side Stable Type

Relay which turns on when the coil is energized and turns off when deenergized.

1 Coil Latching Type

Relay with latching construction that can maintain the on or off state with a pulse input. With one coil, the relay is set or reset by applying signals of opposite polarities.

2 Coil Latching Type

Relay with latching construction composed of 2 coils: set coil and reset coil. The relay is set or reset by alternately applying pulse signals of the same polarity.

Operation Indication

Indicates the set and reset states (electrically or mechanically) for easy maintenance. Also available are an LED version (HC relay with LED).

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4. Terminal Configuration

Type PC board through hole terminal

PC board self-clinching terminal

Plug-in terminal Quick connect terminal Screw terminal
Typical relay
Typical relay
GQ(AGQ) Relays
TX Relays
DS Relays
TQ Relays HJ Relays
HN Relays
LE Relays
LF Relays
HE Relays
EP Relays

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5. Mounting Method

Type Insertion mount

Socket mount

Terminal socket mount TM type TMP type
Typical relay
TQ Relays
DS Relays
S Relays
NC Relays
HC Relays
HJ Relays
HC Relay
HC Relays
HL Relays
LE Relays
LF Relays

Sockets are available for certain PC board relays. (S relay, ST relay, etc.)

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