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Small Safety Limit Switch


Smallest Class of Safety Limit Switches in the World


Degree of protection *1 IP67 (EN60947-5-1)
Durability *2 Mechanical 10,000,000 times min.
Electrical 1,000,000 times min. (4 mA resistive load at 24 VDC, 4 circuits)
150,000 times min. (1 A resistive load at 125 VAC, 2 circuits/4 mA resistive load at 24
VDC, 2 circuits) *3
Operating speed 1 mm/s to 0.5 m/s
Operating frequency Mechanical 120 operations/minute
Electrical 30 operations/minute
Contact resistance *5 300 mΩ max. (with 1 m cable), 500 mΩ max. (with 3 m cable), 700 m Ωmax. (with 5 m
Minimum applicable load *4 4 mA resistive load at 24 VDC, 4 circuits (N-level reference value)
Rated insulation voltage (Ui) 250 V
Rated frequency 50/60 Hz
Protection against electric shock Class I (with a ground wire)
Pollution degree (operating environment) 3 (EN60947-5-1)
Impulse withstand
Between terminals
of same polarity
2.5 kV
Between terminals
of different polarity
4 kV
Between each
terminal and ground
4 kV
Insulation resistance 100 MΩ min. (at 500 VDC) between terminals of the same polarities, between terminals
of different polarities, between current-carrying metal parts and grounds, and between
each terminal and non-current carrying metal parts
Contact gap 2 × 2 mm min.
Vibration resistance Malfunction 10 to 55 Hz, 0.75 mm single amplitude
Shock resistance Destruction 1,000 m/s2 min.
Malfunction 300 m/s2 min.
Conditional short-circuit current 100 A (EN60947-5-1)
Conventional free air thermal current (Ith) 2.5 A (EN60947-5-1)
Ambient operating temperature - 30 to 70°C (with no icing)
Ambient operating humidity 95% max.
Cable UL2464 No. 22 AWG, finishing O.D.: 8.3 mm
Weight Approx. 190 g (D4F-102-1R, with 1 m cable)
Approx. 220 g (D4F-120-1R, with 1 m cable)

Note: 1. The above values are initial values.
           2. Once the contact is opened or closed with an ordinary load, it cannot be used for a load smaller than that. The
               contact surface may be rough, which impairs the reliability of contacting.
*1. The degree of protection shown above is based on the test method specified in EN60947-5-1. Be sure to confirm in
       advance the sealing performance under the actual operating environment and conditions.
*2. Durability values are calculated at an operating temperature of 5 to 35°C, and an operating humidity of 40% to 70%.
       Contact your OMRON sales representative for more detailed information on other operating environments.
*3. Do not apply 1 A at 125 VAC to more than two circuits.
*4. The value will vary depending on factors such as the switching frequency, the ambient environment, and the reliability
       Be sure to confirm correct operation with the actual load before application.
*5. The contact resistance was measured with 0.1 A at 5 to 8 VDC with a fall-of-potential method.