Product Information

BEW(S) Models Specifications

BEW (S) Types


Input voltage100 V AC± 10% 50/60 Hz
200 V AC   
400 V AC
Maximum input voltageAC250VAC250VAC510VAC510VAC510V
Rectification method Half-wave rectification
Output voltageDC45VDC90VDC45VDC90VDC180V
Output current When the ambient temperature is 20℃ values in () are for an ambient temperature of 60℃ DC1.0A (DC0.6A)
Output Wattage When the ambient temperature is 20℃ values in () are for an ambient temperature of 60℃45W (25W)90W (50W)45W (25W)90W (50W)180W (100W)
Size setting Voltage specifications numbers in parentheses are input in voltagesDC45V (AC100V)DC90V (AC200V)DC45V (AC100V)DC90V (AC200V)DC180V (AC400V)
●: Applicable △: Applicable depending on clutch/brake model01
Applied clutches/brakes MIKI PULLEY electromagneticactuated clutches and brakes Rated voltage DC 45/90/180 V Spring-actuated brake
Insulating resistance Between terminal and body DC 500 V, 100 M Ω with Megger
1000 V AC, 50 Hz, 1 min. 2000 V AC, 50 Hz, 1 min.
Usage environment With no condensation -20℃ to +60℃
Mass Per product 0.021 kg



[Terminals and Functions]

Terminal symbolTerminal nameFunction description
1-2Power supply input terminalConnector for a commercial power supply
3-4Output terminalConnector for an electromagnetic clutch or brake


Output type

BEW-2S/4S types take a commercial power supply as the input and generate a half-wave rectified DC voltage on the output side. These power supply devices are known for their very simple construction and low cost, but their voltage pulse is large. They are therefore prone to generating variations in operating response in electromagnetic clutches and brakes, they produce a howling noise when conducting, and they tend to generate more heat from their electromagnetic coils than full-wave rectified supplies or smoothing supplies.
When the above are to be avoided, consider changing to a full-wave rectified supply (BEW-R types), smoothing supply, or a DC 24 V specification.
[How to Calculate Output Voltage]
Output voltage = Input voltage × a (a set coefficient)
* a (set coefficient) = 0.45: half-wave rectification
BEW-2S: AC100V × 0.45 = DC45V
BEW-4S: AC400V × 0.45 = DC180V
Note that when the rated voltage of the electromagnetic coil does not match the output voltage calculated above, you will not be able to obtain the electromagnetic clutch/brake characteristics given in the specifications.

[Wiring Methods and Timing Charts]

Primary Control

Secondary Control

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