DATA SHEETAUTOMOTIVE LATCHING RELAYS

EM1KT SERIESDESCRIPTIONThe NEXEM EM1KT series is latching relay of PC-board mount type and suitable for power supply, fan, pumps, heater, CR circuitscontrols and other applications for automobiles which require high quality and high performance.

FEATURE・ Large current capacity (81A 1hour at 20℃)
・ Two coils latching type・ High heat resistance・ Flux tight housing
・ Pb free・ Through-hole reflow soldering available

APPLICATION・ Power supply
・ Motor control such as fan and pumps
・ Heater control
・ CR circuit control・ Lamp control

For Proper Use of Miniature Relays
DO NOT EXCEED MAXIMUM RATING
Do not use relay under excessive conditions such as over ambient temperature, over voltage and over current. Incorrect use could result in abnormal
heating and damage to the relay or other parts.

READ CAUTIONS IN THE USER’S MANUAL
Read the cautions described in EM Devices' “AUTOMOTIVE POWER RELAY USER’S MANUAL” before does designing your relay applications.

●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact EM Devices for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "AUTOMOTIVE POWER RELAY USER’S MANUAL" in web site.
●No part of this document may be copied or reproduced in any form or by any means without the prior written consent of EM Devices Corporation.

-1-

https://www.em-devices.com/en/
August, 2024 ERCP24-088-1E

EM1KT SERIESSCHEMATICS (BOTTOM VIEW)

Reset (-)

Set (-)

7Reset234Set

156(+)DIMENSIONS (in mm)

Logo

Country of Origin

VENT HOLE(Sealed/Unsealed)

PHILIPPINES

Part Number

EM1KT-7U6
2C1 999

Lot code

1.3* 2.8 -0.5

+1.0

16.3 ±0.5

14.4 ±0.5

9.6

5.45

7.0

10.0

* 2-1.7x0.6

12.4 ±0.5* 3-0.9x0.4* 2-1.7x0.4

2.7
6.0

5.0

* AFTER SOLDER DIP

2.6

RECOMMENDED PCB PAD LAYOUT (BOTTOM VIEW) (in mm)+0.14-φ2.1 -0+0.1

3-φ1.3 -0●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact EM Devices for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "AUTOMOTIVE POWER RELAY USER’S MANUAL" in web site.
●No part of this document may be copied or reproduced in any form or by any means without the prior written consent of EM Devices Corporation.

-2-August, 2024 ERCP24-088-1E

EM1KT SERIESSPECIFICATIONS(Ambient temperature: 20°C)
ItemsSpecifications

Contact form

Contact rating

1 form UMax. switching voltage (1)16VdcMax. switching current (1)100A ON / 60A OFF at 14Vdc

Min. switching current

1A at 5Vdc

Max. carrying current (2)81A at 14Vdc for 1hour at 20°C
2.5mΩ typical, 25mΩ max.

Contact resistance(6Vdc–7A voltage drop method, initial)

Rated load

40A-14Vdc, Resistive load

Contact material

Silver oxide complex alloy

Operate time (3)10ms max.

Release time (3)10ms max.

Insulation resistance

100MΩ min. at 500Vdc

Breakdown

Between open contacts

500Vac min. for 1minutevoltage

Between coil and contact

500Vac min. for 1minuteShock resistance

Misoperation

98m/s2

Destructive failure

980m/s2

Vibration

Misoperation

10 to 300Hz, 43m/s2

resistance

Destructive failure

10 to 500Hz, 43m/s2 for 200hours

Ambient temperature
Life expectancy-40 to +125°C (no freezing)

Mechanical

1,000,000 cycles

Electrical

100,000 cycles (Rated load)

Weight8g typical(1) Resistive, 10cycles(2) Copper thickness: 105µm, width: 15mm.
(3) Excluding contact bounce, nominal voltage applied, without flywheel coil diode(4) EM Devices recommends that the usage of the coating agent close to the relay is to be avoided.

COIL RATING(Ambient temperature: 20°C)
NominalVoltage(VDC)
12CoilNominalResistanceSet Voltage (5)Reset Voltage (5)Operating Power(Ω)±10%)

(VDC)

(VDC)

(W)

Set

Reset80

80

7.2

7.2

Set

Reset

1.8

1.8

(5) Test by pulse voltage●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact EM Devices for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "AUTOMOTIVE POWER RELAY USER’S MANUAL" in web site.
●No part of this document may be copied or reproduced in any form or by any means without the prior written consent of EM Devices Corporation.

-3-August, 2024 ERCP24-088-1E

EM1KT SERIESPART NUMBER SYSTEM
EM1KT- 7U6

SType

Enclosure

Nil:

Unsealed

S:

SealedMust operate voltage

6:

7.2V

Contact Material

U:

Silver oxide complex alloy (Standard)

Coil Resistance

7:

80Ω

Contact form

Coil Nominal voltage

Coil Resistance

Sealed type

Unsealed type

1u

12VDC80Ω

EM1KT-7U6SEM1KT-7U6●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact EM Devices for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "AUTOMOTIVE POWER RELAY USER’S MANUAL" in web site.
●No part of this document may be copied or reproduced in any form or by any means without the prior written consent of EM Devices Corporation.

-4-August, 2024 ERCP24-088-1E

EM1KT SERIESRECOMMENDED COIL DRIVE CIRCUIT OF EM1KT RELAY

Relay coil

Relay coil

Relay coilZener
diode(a)(b)

DiodeZener
diode(c)THE COIL DRIVE CIRCUIT OF EM1KT RELAY THAT EM Devices DOES NOT RECOMMEND

Relay coil

Diode(d)(Note)EM Devices recommends coil drive circuit (b) and (c) for coil flyback suppression, but does not recommend thecircuit (d) because the performance of the EM1KT relay does not appear enough.

●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact EM Devices for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "AUTOMOTIVE POWER RELAY USER’S MANUAL" in web site.
●No part of this document may be copied or reproduced in any form or by any means without the prior written consent of EM Devices Corporation.

-5-

August, 2024 ERCP24-088-1E

EM1KT SERIESPRECAUTIONS REGARDING LATCHING RELAYS• Apply a voltage to the coil in the polarity specified by the internal connection diagram of the relay. With a double
coil latching type relay, do not apply voltage in a manner that both the set and reset coils are energized at thesame time.
• A latching relay is driven by a pulsating coil voltage. The pulse width of this drive voltage must be 10ms or wider.
If the pulse is too short, the relay may not operate.
• A latching relay is factory-set to the reset state for shipment. However, it may be set while being transported due
to vibration or shock. Make sure that the relay is reset when its application system starts operating. When therelay is employed in a portable system, the circuit must be designed so that the relay is reset at the beginning ofoperation of the system because the relay may be set by unexpected vibration or shock.
• When configuring a self-holding circuit that uses the self-break contacts of the relay, note that the coil drive
circuit is disconnected by the self-contacts, causing troubles such as self-oscillation.

●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact EM Devices for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "AUTOMOTIVE POWER RELAY USER’S MANUAL" in web site.
●No part of this document may be copied or reproduced in any form or by any means without the prior written consent of EM Devices Corporation.

-6-August, 2024 ERCP24-088-1E