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Instantaneous stop restart relay:MB4 series

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Ideal for use in restarting motor after an instantaneous power failure in large scale industrial units such as plants.

Having the automatic restart in the time of voltage dip as a sequential starting method, this relay helps reducing the workloads of the power supply. 3 types of operating modes such as instantaneous restart, timed restart, and anti-restart are available depending on the duration of the power failure.

MB4 series image
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Product Descricption

  • Feature
  • Types and ratings
  • Dimentions
  • Type number nomenclature

Reduction in the power supply work loads

Capable of reducing the workloads of power supply in an industrial unit, having an automatic restart in the times of plant’s instantaneous power dip as a sequential starting method.

3 types of operating modes

3 types of operating modes such as instantaneous restart, timed restart, and anti-restart are available depending on the duration of power dip.

Release output

Capable of reliable releasing of the maintained circuit, despite the residual voltage in the power supply circuit.

High precision

Timed restart is set digitally having no cause of offset-errors.

Easy to set up

Plung-in type for easy installation.

Ratings and Specifications

Item Performance
Power failure detection voltage 65%±5%Ue(25℃) temperature error±2%Ue(at 25℃)
Power reset detection voltage 89%±2%Ue at50Hz(25℃)temperature error±2%Ue(at 25℃)
91%±2%Ue at60Hz
Time length for anti-instantaneous restart(※1) 0.02±0.02sec./0.175±0.025sec.(incl. temperature error)
Time length for anti-
timed-restart(※2)
0.5±0.1sec./1±0.1sec./2±0.2sec./4.5±0.5sec.(incl. temperature error)
Output pulse width (both a contact and b contact) 0.1±0.025sec.(incl. temperature error)
Reset time(※3) 5sec. Max.
Maximum allowable power supply volatege 110%Ue
Permissible ambient temperature range -10~+50℃(No icing, No condensation)
Permissible relative humidity 35~85%(No icing, No condensation)
Control output AC240V 2A(Resistive load)
Power consumption AC100V・・・Approx. 0.3VA AC200V・・・Approx. 0.7VA
AC110V・・・Approx. 0.4VA AC220V・・・Approx. 0.8VA
AC120V・・・Approx. 0.4VA AC240V・・・Approx. 0.9VA
Surge resistance 2000V(JIS C 61000-4-5)
Noise immunity (Malfunction) Noise simulator method,
Pulse ovelay 1000V without malfunction
Waveform:Noise width 1μs,
Rise 1ns and under, posituve/negative
Phase0 ~ 360°, Recurring sync with power supply
applied for 1min.
Between socket terminals
Dielectric strength 2000V AC 1min. between current carrying part and non-current currying part
1000V AC 1min. between open contact
Insulation resistance not less than 100MΩ(DC500V DC megger)
Vibration Malfunction 10~55Hz double amplitude
0.5mm(10 times each in triaxial directions)
Durability 10~55Hz, 0.75mm double amplitude(1 hour each in triaxial directions)
Shock resistance Malfunction 100m/s2(4 times each in triaxial directions)
Durability 500m/s2(5 times each in triaxial directions)
Mechanical durability (Output contact) 20 million operations
Mass Approx.100g

(※1)
Time length for anti instantaneous restart…
Indicate that the minimum duration of a power failure to suppress timed-restart.
(indicate the maximum duration of a power failure to perform an instantaneous restart.)
(※2)
Time length for anti-timed-restart…
Indicate the minimum duration of a power failure to suppress a timed-restart.
(indicate the maximum duration of a power failure to perform a timed-restart.)
(※3)
Reset time…Time that is from the load starts until the relay become capable operation.
●Sockets are available.

Automatic restart relay for instantaneous power failure MB4 series

Dimensions MB4

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