WHBSA
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WHBSA

WHBSA Braking Resistors

Specially designed for hybrid and electric buses and trucks.

  • compact dimensions
  • fully welded construction (no seals in the cooling circuit)
  • fully insulated, without external active components
  • IP 65
  • low thermal drift, 100 ppm/K
  • silent operation
  • available in OEM versions

Water-cooled braking resistors for use in buses and trucks can withstand high braking power loads. The resistor can handle a power range defined as continuous heating power without any loss of properties. For the downhill test, the resistor can withstand an overload of over twice the power for 12 minutes. The overload factor compared to the heating power is 3.4 for 10 seconds and 3.1 for 15 seconds, in a 60-second cycle.Braking resistors are offered in three diameters and various lengths, totaling 16 different physical sizes. Resistance values depend on size/power.Resistive elements quickly dissipate energy to the coolant. A 30-second cooling system activation delay is recommended. Minimum and maximum coolant temperatures at the inlet and outlet depend on the coolant mixture properties. Recommended ΔT f ≤ 20⁰C. For a water-glycol mixture at a system pressure of 1 bar, the maximum temperature is 120⁰C. Pressure drop between inlet and outlet ranges from 0.2 to 0.5 bar, depending on coolant flow, inlet/outlet water connection size, and materials used.Main FeaturesWHBSA 150.xxx Braking Power 38-160kWWHBSA 200.xxx Braking Power 63-253kW

Dimensions (excluding water connections) L = xxx mm WHBSA 100.xxx WHBSA 150.xxx WHBSA 200.xxx
Braking Power kW 19 - 32 38 - 160 63 - 253
L mm 255-375 255 - 820 255 - 790
Total Length mm L+94 L+96 L+110
Width mm 155 210 260
Height mm 143 183 233
Tank Diameter mm Ø114.3 Ø168.3 Ø219.1
Tank Size DN DN100 DN150 DN200
Mounting Holes (extended holes) mm Ø10.5x15 Ø10.5x15 Ø10.5x15
Mounting Hole Distance mm L-83 L-83 L-83
Water Connections per DIN 71550 mm Ø32 Ø32 Ø50
Optional Water Connections mm Ø25 - Ø32
Enclosure Material AISI 304 AISI 304 AISI 304
Enclosure Size mm 152x132x86 152x132x86 210x210x100
½" Drain Valve optional optional optional
Resistors and Holes optional optional optional
PT100 Sensor standard standard standard
WHBSA
Electrical
Resistance Tolerance ± 5%
Temperature Coefficient 100 ppm/K
Maximum Operating Voltage 1000VAC
Dielectric Strength 3.5kV at 50 Hz, 1 min.
Insulation Resistance ≥ 20 MΩ @ 5000VDC
Material
Resistive Elements AISI 321
Enclosure AISI 304
Supports and Tank AISI 304
Choke Nickel Coated
Storage Temperature (empty) -30°C to +90°C
Mechanical
Protection Class IP65
Cooling
Recommended ΔT [°C] ≤ 20
Operating Pressure [bar] ≤ 3
Test Pressure [bar] 4.5 at 20°C for 1 hour
Pump Activation Time 30
WHBSA 100.xxx L=xxx Unit 255 315 375
Braking Power kW 19 26 32
Maximum Power 10s/60s kW 30 41 50
Maximum Power 15s/60s kW 28 37 46
Heating Power kW 9 12 15
Minimum Resistance Ω 0.4 0.5 0.6
Total Length mm L+94
Width mm 155
Height mm 143
Tank Diameter mm Ø 114.3
DN Size DN100
Mounting Holes (extended holes) mm Ø 10.5x15
Mounting Hole Distance mm L-83
Water Connections mm Ø 32 (optional 25)
Enclosure Size mm 152x132x86
Weight (excluding water) kg 14 16 17
Water + 50% Glycol Flow at Braking Power, ∆T=20°C L/min 1.9 2.2 2.5
Water + 50% Glycol Flow at Heating Power, ∆T=20°C L/min 24 33 40
WHBSA 150.xxx L=xxx Unit 255 315 375 525 670 820
Braking Power kW 38 51 64 96 128 150
Maximum Power 10s/60s kW 61 81 102 152 201 253
Maximum Power 15s/60s kW 55 74 93 138 183 230
Heating Power kW 18 24 30 45 60 75
Minimum Resistance Ω 0.2 0.3 0.3 0.5 0.6 0.8
Total Length mm L+96
Width mm 210
Height mm 183
Tank Diameter mm Ø168.3
DN Size DN150
Mounting Holes (extended holes) mm Ø10.5x15
Mounting Hole Distance mm L-83
Water Connections mm Ø32
Enclosure Size mm 152x132x86
Weight (excluding water) kg 20 22 24 29 34 39
Water + 50% Glycol Flow at Braking Power, ∆T=20°C L/min 4 5 6 8.4 10.7 13
Water + 50% Glycol Flow at Heating Power, ∆T=20°C L/min 48 64 81 121 162 202
WHBSA 150.xxx L=xxx Unit 255 345 430 520 610 700
Braking Power kW 53 95 126 158 189 221
Maximum Power 10s/60s kW 100 150 199 250 299 349
Maximum Power 15s/60s kW 91 137 181 227 272 318
Heating Power kW 255 345 430 520 610 700
Minimum Resistance Ω 53 95 126 158 189 221
Total Length mm L+110
Width mm 260
Height mm 233
Tank Diameter mm Ø219.1
DN Size DN200
Mounting Holes (extended holes) mm Ø10.5x15
Mounting Hole Distance mm L-83
Water Connections mm Ø50 (optional Ø32)
Enclosure Size mm 210x210x100
Weight (excluding water) kg 22 27 32 36 41 46
Water + 50% Glycol Flow at Braking Power, ∆T=20°C L/min 7 10 13 16 19 23
Water + 50% Glycol Flow at Heating Power, ∆T=20°C L/min 80 120 159 200 239 279



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WHBSA Braking Resistors

Specially designed for hybrid and electric buses and trucks.

  • compact dimensions
  • fully welded construction (no seals in the cooling circuit)
  • fully insulated, without external active components
  • IP 65
  • low thermal drift, 100 ppm/K
  • silent operation
  • available in OEM versions

Water-cooled braking resistors for use in buses and trucks can withstand high braking power loads. The resistor can handle a power range defined as continuous heating power without any loss of properties. For the downhill test, the resistor can withstand an overload of over twice the power for 12 minutes. The overload factor compared to the heating power is 3.4 for 10 seconds and 3.1 for 15 seconds, in a 60-second cycle.Braking resistors are offered in three diameters and various lengths, totaling 16 different physical sizes. Resistance values depend on size/power.Resistive elements quickly dissipate energy to the coolant. A 30-second cooling system activation delay is recommended. Minimum and maximum coolant temperatures at the inlet and outlet depend on the coolant mixture properties. Recommended ΔT f ≤ 20⁰C. For a water-glycol mixture at a system pressure of 1 bar, the maximum temperature is 120⁰C. Pressure drop between inlet and outlet ranges from 0.2 to 0.5 bar, depending on coolant flow, inlet/outlet water connection size, and materials used.Main FeaturesWHBSA 150.xxx Braking Power 38-160kWWHBSA 200.xxx Braking Power 63-253kW

Dimensions (excluding water connections) L = xxx mm WHBSA 100.xxx WHBSA 150.xxx WHBSA 200.xxx
Braking Power kW 19 - 32 38 - 160 63 - 253
L mm 255-375 255 - 820 255 - 790
Total Length mm L+94 L+96 L+110
Width mm 155 210 260
Height mm 143 183 233
Tank Diameter mm Ø114.3 Ø168.3 Ø219.1
Tank Size DN DN100 DN150 DN200
Mounting Holes (extended holes) mm Ø10.5x15 Ø10.5x15 Ø10.5x15
Mounting Hole Distance mm L-83 L-83 L-83
Water Connections per DIN 71550 mm Ø32 Ø32 Ø50
Optional Water Connections mm Ø25 - Ø32
Enclosure Material AISI 304 AISI 304 AISI 304
Enclosure Size mm 152x132x86 152x132x86 210x210x100
½" Drain Valve optional optional optional
Resistors and Holes optional optional optional
PT100 Sensor standard standard standard
WHBSA
Electrical
Resistance Tolerance ± 5%
Temperature Coefficient 100 ppm/K
Maximum Operating Voltage 1000VAC
Dielectric Strength 3.5kV at 50 Hz, 1 min.
Insulation Resistance ≥ 20 MΩ @ 5000VDC
Material
Resistive Elements AISI 321
Enclosure AISI 304
Supports and Tank AISI 304
Choke Nickel Coated
Storage Temperature (empty) -30°C to +90°C
Mechanical
Protection Class IP65
Cooling
Recommended ΔT [°C] ≤ 20
Operating Pressure [bar] ≤ 3
Test Pressure [bar] 4.5 at 20°C for 1 hour
Pump Activation Time 30
WHBSA 100.xxx L=xxx Unit 255 315 375
Braking Power kW 19 26 32
Maximum Power 10s/60s kW 30 41 50
Maximum Power 15s/60s kW 28 37 46
Heating Power kW 9 12 15
Minimum Resistance Ω 0.4 0.5 0.6
Total Length mm L+94
Width mm 155
Height mm 143
Tank Diameter mm Ø 114.3
DN Size DN100
Mounting Holes (extended holes) mm Ø 10.5x15
Mounting Hole Distance mm L-83
Water Connections mm Ø 32 (optional 25)
Enclosure Size mm 152x132x86
Weight (excluding water) kg 14 16 17
Water + 50% Glycol Flow at Braking Power, ∆T=20°C L/min 1.9 2.2 2.5
Water + 50% Glycol Flow at Heating Power, ∆T=20°C L/min 24 33 40
WHBSA 150.xxx L=xxx Unit 255 315 375 525 670 820
Braking Power kW 38 51 64 96 128 150
Maximum Power 10s/60s kW 61 81 102 152 201 253
Maximum Power 15s/60s kW 55 74 93 138 183 230
Heating Power kW 18 24 30 45 60 75
Minimum Resistance Ω 0.2 0.3 0.3 0.5 0.6 0.8
Total Length mm L+96
Width mm 210
Height mm 183
Tank Diameter mm Ø168.3
DN Size DN150
Mounting Holes (extended holes) mm Ø10.5x15
Mounting Hole Distance mm L-83
Water Connections mm Ø32
Enclosure Size mm 152x132x86
Weight (excluding water) kg 20 22 24 29 34 39
Water + 50% Glycol Flow at Braking Power, ∆T=20°C L/min 4 5 6 8.4 10.7 13
Water + 50% Glycol Flow at Heating Power, ∆T=20°C L/min 48 64 81 121 162 202
WHBSA 150.xxx L=xxx Unit 255 345 430 520 610 700
Braking Power kW 53 95 126 158 189 221
Maximum Power 10s/60s kW 100 150 199 250 299 349
Maximum Power 15s/60s kW 91 137 181 227 272 318
Heating Power kW 255 345 430 520 610 700
Minimum Resistance Ω 53 95 126 158 189 221
Total Length mm L+110
Width mm 260
Height mm 233
Tank Diameter mm Ø219.1
DN Size DN200
Mounting Holes (extended holes) mm Ø10.5x15
Mounting Hole Distance mm L-83
Water Connections mm Ø50 (optional Ø32)
Enclosure Size mm 210x210x100
Weight (excluding water) kg 22 27 32 36 41 46
Water + 50% Glycol Flow at Braking Power, ∆T=20°C L/min 7 10 13 16 19 23
Water + 50% Glycol Flow at Heating Power, ∆T=20°C L/min 80 120 159 200 239 279



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