S
2a2b/3a1b/4a 4A polarized
power relays
Compliance with RoHS Directive
FEATURES
1. Compact with high sensitivity
The high-efficiency polarized
electromagnetic circuits of the 4-gap
balanced armature and our exclusive
spring alignment method achieves,
with high-sensitivity in a small
package, a relay that can be directly
controlled by a driver chip.
2. Strong resistance to vibration and
shock
Use of 4G-BA technology realizes
strong resistance to vibration and
shock.
3. High reliability and long life
Our application of 4G-BA technology,
along with almost perfectly complete
twin contact, ensures minimal contact
bounce and high reliability.
4. Ability to provide wide-ranging
control
Use of 4G-BA technology with goldclad silver alloy contacts in a twin
contact structure enables control
across a broad range from
microcurrents of 100 µA 100 mV DC to
4 A 250 V AC.
5. Latching types available
With 4G-BA technology, as well as
single side stable types, convenient 2
coil latching types for circuit memory
applications are also available.
6. Wide variety of contact formations
available
The compact size of the 4G-BA
mechanism enables the provision of
many kinds of package, including
2a2b, 3a1b, and 4a. These meet your
needs across a broad range of
applications.
S RELAYS
7. Low thermal electromotive force
relay
High sensitivity (low power
consumption) is realized by 4G-BA
technology. Separation of the coil and
spring sections has resulted in a relay
with extremely low levels of thermal
electromotive force (approx. 0.3 µV).
8. DIL terminal array
Deployed to fit a 2.54 mm .100 inch
grid, the terminals are presented in DIL
arrays which match the printed circuit
board terminal patterns commonly in
international use.
9. Relays that push the boundaries of
relay efficiency
High-density S relays take you close to
the limits of relay efficiency.
10. Sockets are available.
TYPICAL APPLICATIONS
Telecommunications equipment, data
processing equipment, facsimiles, alarm
equipment, measuring equipment.
4-GAP BALANCED ARMATURE MECHANISM
1. Armature mechanism has excellent
resistance to vibration and shock
The armature structure enables free
rotation around the armature center of
gravity. Because the mass is maintained
in balance at the fulcrum of the axis of
rotation, large rotational forces do not
occur even if acceleration is applied
along any vector. The mechanism has
proven to have excellent resistance to
vibration and shock. All our S relays are
based on this balanced armature
mechanism, which is able to further
provide many other characteristics.
2. High sensitivity and reliability
provided by 4-gap balanced armature
mechanism
As a (polarized) balanced armature, the
S relay armature itself has two
permanent magnets. Presenting four
interfaces, the armature has a 4-gap
structure. As a result, the rotational axis
at either end of the armature is
symmetrical and, in an energized into a
polarized state, the twin magnetic
armature interfaces are subject to
repulsion on one side and attraction on
the other. This mechanism, exclusive to
Panasoinc Electric Works, provides a
highly efficient polarized magnetic circuit
structure that is both highly sensitive and
has a small form factor. Moreover,
suitability for provision with many types of
contact array and other advantages
promise to make it possible to provide
many of the various characteristics that
are coming to be demanded of relays.
HOW IT WORKS (single side stable type)
1) When current is passed through the
coil, the yoke becomes magnetic and
polarized.
2) At either pole of the armature,
repulsion on one side and attraction on
the other side is caused by the interaction
of the poles and the permanent magnets
of the armature.
3) At this time, opening and closing
operates owing to the action of the
simultaneously moulded balanced
armature mechanism, so that when the
force of the contact breaker spring closes
the contact on one side, on the other
side, the balanced armature opens the
contact (2a2b).
Repulsion
Permanent magnet
N
Attraction
N
Residual plate
S
N
Attraction
S
S
Axis
Repulsion
All Rights Reserved © COPYRIGHT Panasonic Electric Works Co., Ltd.
S
2) 2 coil latching
Type
Nominal coil
voltage
Set voltage
Reset voltage
(at 20°C 68°F) (at 20°C 68°F)
Nominal operating
current [±10%]
(at 20°C 68°F)
Coil resistance
[±10%]
(at 20°C 68°F)
Nominal operating
power
(at 20°C 68°F)
Coil inductance
Max. applied
voltage
(at 40°C 104°F)
Set coil
Reset
coil
Set coil
Reset
coil
Set coil
Reset
coil
Set coil
Reset
coil
3V DC
66.7mA
66.7mA
45Ω
45Ω
200mW
200mW
Approx.
10mH
Approx.
10mH
5.5V DC
5V DC
38.5mA
38.5mA
130Ω
130Ω
192mW
192mW
Approx.
31mH
Approx.
31mH
9.0V DC
Approx.
40mH
11.0V DC
6V DC
Standard
12V DC
70%V or less
of nominal
voltage
(Initial)
70%V or less
of nominal
voltage
(Initial)
33.7mA
33.7mA
180Ω
180Ω
200mW
200mW
Approx.
40mH
16.7mA
16.7mA
720Ω
720Ω
200mW
200mW
Approx.
170mH
Approx.
170mH
22.0V DC
Approx.
680mH
44.0V DC
Approx.
1,250mH
65.0V DC
24V DC
8.4mA
8.4mA
2,850Ω
2,850Ω
202mW
202mW
Approx.
680mH
48V DC
7.4mA
7.4mA
6,500Ω
6,500Ω
355mW
355mW
Approx.
1,250mH
2. Specifications
Characteristics
Contact
Rating
Item
Arrangement
Contact resistance (Initial)
Electrostatic capacitance (initial)
Contact material
Thermal electromotive force (at nominal coil voltage)
(initial)
Nominal switching capacity (resistive load)
Max. switching power (resistive load)
Max. switching voltage
Max. switching current
Minimum operating power
Nominal operating power
Min. switching capacity (Reference value)*1
Insulation resistance (Initial)
Breakdown voltage
(Initial)
Electrical
characteristics
Between open contacts
Between contact sets
Between contact and coil
Temperature rise (coil) (at 20°C 68°F)
Operate time [Set time] (at 20°C 68°F)
Release time [Reset time] (at 20°C 68°F)
Functional
Destructive
Functional
Vibration resistance
Destructive
Mechanical
Electrical
Shock resistance
Mechanical
characteristics
Expected life
Conditions
Conditions for operation, transport and storage*2
Max. operating speed
Unit weight
Specifications
2 Form A 2 Form B, 3 Form A 1 Form B, 4 Form A
Max. 50 mΩ (By voltage drop 6 V DC 1A)
Approx. 3pF
Au clad Ag alloy (Cd free)
Approx. 3µV
4 A 250 V AC, 3 A 30 V DC
1,000 VA, 90 W
250 V AC, 48 V DC (30 to 48 V DC at less than 0.5 A)
4 A (AC), 3 A (DC)
100 mW (Single side stable, 2 coil latching)
200 mW (Single side stable, 2 coil latching)
100µA 100 m V DC
Min. 10,000MΩ (at 500V DC)
Measurement at same location as “Breakdown voltage” section.
750 Vrms for 1min. (Detection current: 10mA.)
1,000 Vrms for 1min. (Detection current: 10mA.)
1,500 Vrms for 1min. (Detection current: 10mA.)
Max. 35°C
(By resistive method, nominal coil voltage applied to the coil; contact carrying current: 4A.)
Max. 15 ms [15 ms] (Nominal coil voltage applied to the coil, excluding contact bounce time.)
Max. 10 ms [15 ms] (Nominal coil voltage applied to the coil, excluding contact bounce time.)
(without diode)
Min. 490 m/s2 (Half-wave pulse of sine wave: 11 ms; detection time: 10µs.)
Min. 980 m/s2 (Half-wave pulse of sine wave: 6 ms.)
10 to 55 Hz at double amplitude of 3 mm (Detection time: 10µs.)
10 to 55 Hz at double amplitude of 4 mm
Min. 108 (at 50 cps)
Min. 105 (4 A 250 V AC), Min. 2×105 (3 A 30 V DC) (at 20 times/min.)
Ambient temperature: –55°C to +65°C –67°F to +149°F
Humidity: 5 to 85% R.H. (Not freezing and condensing at low temperature)
20 times/min. for maximum load, 50 cps for low-level load (1 mA 1 V DC)
Approx. 8 g .28 oz
Notes: *1. This value can change due to the switching frequency, environmental conditions, and desired reliability level, therefore it is recommended to check this with the
actual load.
*2. The upper limit of the ambient temperature is the maximum temperature that can satisfy the coil temperature rise value. Refer to Usage, transport and storage
conditions in NOTES.
All Rights Reserved © COPYRIGHT Panasonic Electric Works Co., Ltd.
