DATA SHEET
EP2S/EP1S SERIES
AUTOMOTIVE RELAYS
LOW SOUND PRESSURE
Document No. ER0131EJ1V0DS00
Date Published April 1996 M
Printed in Japan
1996
DESCRIPTION
The NEC EP2S / EP1S series are PC-board mount type automotive relays suitable for various motor controls
and other applications that require a high level of quality and performance.
The sound pressure level of EP2S / EP1S series is 57 dBA nominal when the relay operates, and 49 dBA
nominal when the relay releases.
FEATURES
™Less sound pressure (–10 dB at “operate” and –3 dB at “release” compared with EP2 / EP1)
™For motor and solenoid reversible control
™High performance and productivity by unique structure
™Flux tight housing
APPLICATION
™Power window control
™Electrical door lock
™Wiper system
©
EP2S SERIES EP1S SERIES
2
EP2S / EP1S SERIES
SCHEMATIC (BOTTOM VIEW)
EP2S SERIES EP1S SERIES
DIMENSIONS mm (inch)
EP2S SERIES
2
1
6
4
57
8
2
1
6
4
57
8
2
14
5
333
9
10
[H Bridge Type]
[Unit A] [Unit B]
[Separate Type]
[Unit A] [Unit B]
JAPAN
16.2 0.5
8.1∗
4- 0.6( 0.22)
23.8 0.5
11.9∗11.9∗
10.1
8.1∗
6.4
5.45
3.1 (0.12)
2.2
(0.31)
3.5
3.5
8.0
10.1 2-0.5×1.1(0.02×0.04)
2.2
5.45
16.0 0.5
0.5(0.02)
3.5
Vent hole
Date code
Part number
JAPAN
EP
2S-3
L1T
0G
3 24
16.2 0.5
8.1∗
23.8 0.5
11.9∗11.9∗
10.1
8.1∗
6.4
5.45
3.1
2.2
8.0
∗ for reference ∗ for reference
3.5
8.0
10.1
2.2
5.45
16.0 0.5
0.5(0.02)
3.5
EP
2S-3
L1
0G3 24
Separate type
discrimination mark
3.1
6.4
Separate TypeH Bridge Type
(0.94) (0.64)
+
–
+
–
Vent hole
Date code
Part number
+
–
2-1.3×1.3(0.05×0.05)
φφ
(0.09)
(0.21)
(0.25)
(0.4)
8.0
(0.14)
(0.09)
(0.21)
(0.4)
(0.31)
(0.14)
(0.14)
(0.63)
4-0.5×1.1(0.02×0.04)
2(0.079)
φ
(0.94) (0.64)
(0.63)
(0.14)
(0.4)
(0.31)
(0.14)
2-1.3×1.3(0.05×0.05)
4- 0.6( 0.22)
φφ
(0.31)
(0.4)
(0.47)(0.47)(0.47) (0.47)
3.5(0.14)
(0.09)
(0.12)
(0.21)
(0.21)
(0.09)
(0.12)
(0.21)
(0.25)
(0.32)(0.32)
(0.32)(0.32)
+
–+
–
+
–
3
EP2S / EP1S SERIES
EP1S SERIES
[H Bridge Type] [Separate Type]
2- 1.9 +0.1
–0 2- 1.9 +0.1
–0
1.9 +0.1
–0
4- 1.5 +0.1
–0
2- 1.1 +0.1
–0
2- 1.5+0.1
–0
4- 1.1+0.1
–0
2- 1.5 +0.1
–0
4- 1.1+0.1
–0
φ
φ
φ
φφφφ
φφ
( 0.075)
φ
( 0.075)
φ
EP2S SERIES EP1S SERIES
( 0.043)
φ
( 0.059)
φ
( 0.075)
φ
( 0.043)
φ
( 0.059)
φ
( 0.043)
φ
( 0.059)
φ
PCB PAD LAYOUT mm (inch) (BOTTOM VIEW)
JAPAN
EP1S-B3G1
22
14.6 0.5 16.2 0.5
16.0 0.5
0.5(0.02)
3.5
3.16.4
2.2
5.45
10.1(0.4) 2.65∗(0.1)
8.0(0.31)
3.5
1.3×1.3
2-0.5×1.1
2- 0.6
Vent hole
Date code
Part number
4A 1
+
–+
–
+
–
φ
(1.5×1.5)
(0.02×0.02)
∗for reference
(0.12)
(0.25)
(0.14)
( 0.02)
φ
(0.21)
(0.09)
(0.14)
(0.63)
(0.63)(0.58)
4
EP2S / EP1S SERIES
SPECIFICATIONS
Items
Contact Form
Contact Material
Contact Resistance
Contact Switching Voltage
Contact Switching Current
Contact Carrying Current
Operate Time
Release Time
Normal Operate Power
Insulation Resistance
Breakdown Voltage
Shock Resistance
Vibration Resistance
Ambient Temperature
Coil Temperature Rise
Life Expectancy
Weight
EP2S EP1S
1 form C×2 (H bridge type and separate type) 1 form C
Silver oxide complex alloy
50 mΩ max. (measured at 7 A) initial
16 Vdc max.
25 A max.
20 A / regular type 25 A / regular type
(2 minutes max. 12 Vdc at 85˚C) (2 minutes max. 12 Vdc at 85˚C)
25 A / high carrying current type 30 A / high carrying current type
(2 minutes max. 12 Vdc at 85˚C) (2 minutes max. 12 Vdc at 85˚C)
Approx. 5 ms (at 12 Vdc excluding bounce) initial
Approx. 2 ms (at 12 Vdc excluding bounce) initial
0.64 W (at 12 Vdc)
100 MΩ min. (at 500 Vdc) initial
500 Vdc min. (for 1 minute) initial
98 m / s2 [Approx. 10 G] min. (misoperating)
10 to 300 Hz, 43 m / s2 [Approx. 4.4 G] min. (misoperating)
–40˚C to +85˚C (–40 ˚F to +185˚F)
50 ˚C / W (without contact carrying current)
1×106 operations
1×105 operations (at 14 Vdc, Motor Load 25 A / 7 A)
1×105 operations (at 14 Vdc, Motor Load 20 A / 3 A)
Approx. 15 gr Approx. 8 gr
Mechanical
Electrical
Contact
G
Contact
L or N
at 25 ˚C (77 ˚F)
Sound Pressure level Fast (F) ∗
Operate (at 12 Vdc drive with diode) 57 dBA nominal
Relese (at 12 Vdc drive with diode) 49 dBA nominal
∗ Refer to the measuring condition in the figure of
sound pressure level distribution on page 7.
SOUND PRESSURE LEVEL (for reference)
5
EP2S / EP1S SERIES
COIL RATING
EP2S SERIES
Nominal
Voltage
(Vdc)
12
12
12
12
12
12
Coil
Resistance
(Ω±10 %)
225
225
225
300
300
300
Must
Operate Voltage
(Vdc max.)
6.5
7.0
7.5
7.5
8.0
8.5
Must
Release Voltage
(Vdc min.)
0.9
0.9
0.9
0.9
0.9
0.9
Nominal
Operate Power
(W)
0.64
0.64
0.64
0.48
0.48
0.48
at 25 ˚C (77 ˚F)
Part Number
H Bridge Type Separate Type
EP2S-3L1 EP2S-3L1T
EP2S-3L2 EP2S-3L2T
EP2S-3L3 EP2S-3L3T
EP2S-4L3 EP2S-4L3T
EP2S-4L4 EP2S-4L4T
EP2S-4L5 EP2S-4L5T
EP1S SERIES
Nominal
Voltage
(Vdc)
12
12
12
12
12
12
Coil
Resistance
(Ω±10 %)
225
225
225
300
300
300
Must
Operate Voltage
(Vdc max.)
6.5
7.0
7.5
7.5
8.0
8.5
Must
Release Voltage
(Vdc min.)
0.9
0.9
0.9
0.9
0.9
0.9
Nominal
Operate Power
(W)
0.64
0.64
0.64
0.48
0.48
0.48
Part Number
Regular Type
EP1S-3L1 EP1S-B3G1
EP1S-3L2 EP1S-B3G2
EP1S-3L3 EP1S-B3G3
EP1S-4L3 EP1S-B4G3
EP1S-4L4 EP1S-B4G4
EP1S-4L5 EP1S-B4G5
High Carrying
Current Type
∗ High carrying current type available
6
EP2S / EP1S SERIES
NUMBERING SYSTEM
It is necessary to take more than 100 msec intervals for on / off timing between driving Tr1 and Tr2. If the interval
is less than 100 msec, an excessive current happen to flow to the relay contacts.
TYPICAL APPLICATION (H Bridge Type)
MOTOR
Tr1
Tr2
100 ms min.
Tr1 Tr2
STOP off off
FORWARD on off
REVERSE off on
M
Tr1 Tr2
16 V
EP2S – B 3 L 1 S T
Wiring Nil : H Bridge Type
T : Separate Type
Enclosure Nil : Unsealed (Standard type)
T : Sealed
Operate Voltage
(at 25˚C)
1 : 6.5 V max.
2 : 7.0 V max.
3 : 7.5 V max.
4 : 8.0 V max.
5 : 8.5 V max.
Carrying Current Nil : Regular type
B : high carrying current type
Type EP2S
EP1S
Contact Material
L : Silver oxide complex alloy, Type I
N : Silver oxide complex alloy, Type II
G : Silver oxide complex alloy, Type III
Coil Resistance 3 : 225 Ω±10%
4 : 300 Ω±10%
7
EP2S / EP1S SERIES
TECHNICAL DATA












0.5 1.0 1.50
5
10
Release Time (ms)
Applied Power (W)
0.5 1.0 1.50
5
10
Operate Time (ms)
Applied Power (W)
Mean
With Diode
0.5 1.0 1.50
50
100
Coil Temperature Rise (˚C)
Applied Power (W)
2.0
IC = 0A
10 20
150
Coil Temperature Rise (˚C)
Energized Time (minutes)
300
100
50
Vcoil = 12 V, IC = 25 A
Vcoil = 12 V, IC = 0 A
Vcoil = 7.5 V, IC = 0 A
Vcoil = 7.5 V, IC = 25 A
Operate Time (EP2S-3L1) Release time (EP2S-3L1)
Coil Temperature (EP2S-3L1)
Mean




Without Diode
Distribution of Sound Pressure Level (for reference)
50
40
30
20
10
040 50 60 70
EP2S–3L1
n = 80
Sound Pressure Level (dBA)
Frequency (%)
50
40
30
20
10
040 50 60 70
EP2–3L1
n = 80
Sound Pressure Level (dBA)
Frequency (%)
Release Operate
Measuring Condition
Measuring Equipment : Precision Sound Meter
Detector-indicator Characteristic : Fast (F) specified in IEC 651
Relay Drive : 12 Vdc (Diode clamped)
Distance between Microphone and Sample : 50 mm
Background Noise : less than 35 dB (A)
(A) : Frequency Weighting Characteristic specified in IEC 651
No part of this document may be copied in any form or by any means without the prior written consent of
NEC Corporation.
NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual
property rights of third parties by or arising from use of a device described herein or any other liability arising
from use of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights
or other intellectual property rights of NEC Corporation or others.
EP2S / EP1S SERIES