N3 Drive Operations Manual 
 
Braking Unit & Braking Resistor Selections        21                  
 
15.0 Braking Unit and Braking Resistor Selections 
 
Braking Resistor 
per braking unit 
Braking resistor 
Specification 
Braking  
Resistor Duty 
 Cycle (%) 
Resistor dimension 
(L x W x H) mm 
(inches) 
251*28*60 
(9.88*1.10*2.36) 
251*28*60 
(9.88*1.10*2.36) 
251*28*60 
(9.88*1.10*2.36) 
274*34*78 
(10.79*1.34*3.07) 
395*34*78 
(10.79*1.34*3.07) 
400*40*100 
(15.7*1.57*3.94) 
400*40*100 
(15.7*1.57*3.94) 
535*50*110 (Qty 2) 
(21.1*1.96*4.33) 
535*50*110 (Qty 4) 
(21.1*1.96*4.33) 
535*50*110 (Qty 4) 
(21.1*1.96*4.33) 
615*50*110 (Qty 2) 
(24.21*1.96*4.33) 
251*28*60 
(9.88*1.10*2.36) 
251*28*60 
(9.88*1.10*2.36) 
274*34*78 
(10.79*1.34*3.07) 
395*34*78 
(10.79*1.34*3.07) 
470*50*100 
(15.7*1.57*3.94) 
535*50*110 
(24.21*1.96*4.33) 
615*50*110 
(24.21*1.96*4.33) 
615*50*110 
(24.21*1.96*4.33)  
535*50*110 (Qty 4) 
(21.1*1.96*4.33) 
535*50*110 (Qty 4) 
(21.1*1.96*4.33) 
615*50*110 (Qty 4) 
(24.21*1.96*4.33) 
535*50*110 (Qty 8) 
(21.1*1.96*4.33) 
535*50*110 (Qty 8) 
(21.1*1.96*4.33) 
615*50*110 (Qty 4) 
(24.21*1.96*4.33) 
 
 Formula for brake resistor: W= ( Vpnb * Vpnb ) * ED% / R 
1. W: braking resistor power (Watts) 
2. Vpnb: braking voltage (220V=380VDC, 440V=760VDC) 
3. ED%: braking effective period 
4. R: braking resistor rated ohms 
5. Alternative selection choice:  450: (JNTBU-430 + JNBR-4R8KW32)  2, 460: (JNTBU-430 + JNBR-4R8KW27R2)  2 
 
Above 25HP, please add Braking Transistor Units: 200V JNTBU-230, 400V JNTBU-430, and 400V JUVPHV-0060 
For more detailed information, please contact TECO. 
When installing a braking unit and resistor, ensure that there is adequate clearance and ventilation.