SF-M Relay

Coil data

・Operating characteristics such as "Operate voltage" and "Release voltage" are influenced by mounting conditions, ambient temperature, etc. Therefore, please use the relay within ±5% of rated coil voltage.
・"Initial" means the condition of products at the time of delivery.

Contact arrangement Rated coil voltage Operate
voltage *1
(at 20°C)
voltage *1
(at 20°C)
Rated operating current
at 20°C)
Coil resistance
at 20°C)
Rated operating power Max.
voltage *2
(at 20°C)
2 poles 1 Form A
1 Form B
3 V DC Max. 75% of
rated voltage
Min. 10% of
rated voltage
90 mA 33.3 Ω 270 mW

100 mW
(When retained)
120 % V
of rated
5 V DC 54 mA 92.6 Ω
12 V DC 23 mA 533 Ω
16 V DC 17 mA 948 Ω
18 V DC 15 mA 1,200 Ω
21 V DC 13 mA 1,633 Ω
24 V DC 11 mA 2,133 Ω

*1: Square, pulse drive
*2: It is not allowed to apply the continuous maximum voltage to the coil.
In order to obtain the specified performance, please apply the rated voltage.

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Characteristics Item Specifications
Contact Coil arrangement 1 Form A 1 Form B
Contact resistance, max (Initial) Max. 100 mΩ (By voltage drop 6 V DC 1 A)
Contact material RT Ⅱ : Au flashed AgNi type
RT Ⅲ : Au flashed AgSnO2 type
Contact rating (resistive) N.O. contact (5-6 terminal); 6 A 250 V AC, 6 A 30 V DC
N.C. contact (3-4 terminal); 4 A 250 V AC, 4 A 30 V DC
Max. switching power (resistive) N.O. contact (5-6 terminal); 1,500 VA, 180 W (85 W: when load voltage exceeds 30 V DC)
N.C. contact (3-4 terminal); 1,000 VA, 120 W (85 W: when load voltage exceeds 30 V DC)
Max. switching voltage 250 V AC, 125 V DC
Max. switching current N.O. contact (5-6 terminal): 6 A AC, 6 A DC
N.C. contact (3-4 terminal): 4 A AC, 4 A DC
Min. switching load (reference value)*1 1 mA 10 V DC
insulation resistance (initial) Min. 1,000 MΩ at 500 V DC (Measured portion is the same as the case of dielectric strength.)
Dielectric strength (initial) Between open contacts 1,500 Vrms for 1 min (Detection current: 10 mA)
Between contact and coil N.O. contact (5-6 terminal) - coil; 4,000 Vrms for 1 min
N.C. contact (3-4 terminal) - coil; 2,500 Vrms for 1 min
Coil hold voltage*2 60% of rated voltage (-40°C to 85°C)
Time characteristics (initial) Operate time Max. 15 ms (at rated voltage, at 20°C, without bounce)
Release time*3 Max. 10 ms (at rated voltage, at 20°C, without bounce, without diode)
Shock resistance Functional 200 m/s2 (half-sine shock pulse: 11 ms, detection time: 10 μs)
Destructive 1,000 m/s2 (half-sine shock pulse: 6 ms)
Vibration resistance Functional 10 Hz to 55 Hz (at double amplitude of 2.5 mm, detection time: 10 µs)
Destructive 10 Hz to 55 Hz (at double amplitude of 3.5 mm)
Expected life Mechanical life Min. 10 x 106 ope. (at 180 times/min)
Conditions Conditions for usage,
transport and storage*4
Ambient temperature: -40°C to 85°C
Humidity: 5% RH to 85 % RH
(Avoid icing and condensation)
Unit weight Approx. 6.5 g

*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: Coil holding voltage is the coil voltage after 100 ms from the application of rated coil voltage.
*3: If a diode is connected across the coil in parallel, the release time will be delayed. Check this under actual operating conditions.
*4: For ambient temperature, please read "GUIDELINES FOR RELAY USAGE".

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Expected electrical life

Condition: Resistive load, at 6 times/min (ON : OFF = 1 s : 9 s)

Type Switching capacity Number of operations
RT Ⅱ, RT Ⅲ N.O. contact (5-6 terminal) 6 A 250 V AC 100 x 103 ope.
6 A 30 V DC 100 x 103 ope.
N.C. contact (3-4 terminal) 4 A 250 V AC 100 x 103 ope.
4 A 30 V DC 100 x 103 ope.

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