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Hydraulic-Magnetic Circuit Breaker (HMCB)

JS Series

Compact and lightweight, JS series hydraulic-magnetic circuit breakers are well suited for applications where space comes at a premium such as in the telecom industry. Available in ratings from 0.02 – 50 A, JS series offers a variety of options including snap-in mounting and rocker style handles.

Featured applications: Telecom, rail, defense, medical

Series Features

  • Suitable for AC and DC applications
  • Maintains 100 % rating capability regardless of ambient temperature
  • Rating from 0.02 to 50 A
  • Voltage up to 80 VDC, 415 VAC 
  • Maximum interrupting capacity up to 5'000 A
  • Up to 4 poles
  • Suitable for 400 Hz electrical systems
  • Compact and lightweight design
  • Customizable handles
  • Variety of terminals
  • Optional auxiliary switches (single, double, protected or not)
  • Optional Mid-Trip feature (with our without Alarm switch)
  • Optional double switch redundancy setup (with DPDT switch)
  • Easy panel mounting
  • Compatible with Remote Breaker Reset (RBR) series

 

HMCB Features

All Eaton Heinemann HMCBs have the following features:

  • Large operating temperature range of -40 °C to 85 °C without derating
  • High inrush tolerance
  • Resistance to shocks and vibrations
  • Resistance to humidity and corrosion
  • Immediate resetting after trip
  • Multiple industry and quality certifications

 

HMCB Benefits

  • Extreme temperature protection: Operates reliably from -40 °C to +85 °C, maintaining constant trip ratings and protecting cables and equipment without the need for costly oversizing.
  • Stable rating: Maintains 100 % rating capability regardless of ambient temperature.
  • Precision tripping: Ideal for applications with sensitive equipment requiring precise tripping point protection.
  • Robust Design: Build to last, even in the harshest of environments, reducing maintenance or replacement costs.
  • Minimal Voltage Drop: Lower internal resistance compared to Thermal-magnetic circuit breakers, ideal for low voltage DC applications.
  • Avoid Nuisance Tripping: Shock-resistant and reduces EMC/EMI noise micro-cuts.
  • Harsh Environment Protection: Resistant to humidity and saline environments.
  • Hot-Pluggable Design: Allows maintenance without shutting down the entire system.
  • Integrated auxiliary alarm switch: Saves horizontal space and cost by eliminating the need for extra poles.
Specifications

Electrical characteristics

Maximum number of poles       4
Rating

DC: 0.02 – 50 A

AC: 0.02 – 30 A

Voltage range

DC: up to 80 VDC

AC: up to 415 VAC

Breaker ratings

UL rating

32/65 VDC: 50 A

72/80 VDC: 30 A

250/277 V 50/60 Hz: 30 A

415 V 50/60 Hz: 30 A

240/400 V 400 Hz: 30 A

DIN EN rating

230/400 V 50/60 Hz: 25 A

65 VDC: 50 A

80 VDC: 30 A

Interrupting capacity

UL rating

32 VDC: 5 kA

72 VDC: 2.2 kA

80 VDC: 1.5 kA

250 V 50/60 Hz: 5 kA

415 V 50/60 Hz: 1.5 kA

240 V 400 Hz: 1 kA

DIN rating

230/400 V 50/60 Hz: 1kA

65 Vdc: 1.5kA

80 Vdc: 1.5kA

Dielectric strength 3’750 VAC 50/60 Hz
Insulation resistance 100 MOhm at 500 VDC

Trip specification

Trip options                                                                                                               Series, shunt, relay, remote trip off (Ducon), switch
Trip delay Instantaneous, short, medium, long delay
High inrush

50 Hz: 8x, 15x, 22x In

60 Hz: 10x, 18x, 25x In 

Operating conditions

Operating temperature                                           -40 °C to +85 °C (-40 °F to +185 °F)
Auxiliary contacts SPDT, DPDT, protected or not protected
Mid trip, with our without Alarm switch Optional

Certifications and Approvals

Shock                                                                                                              IEC 60068-2-27, MIL-STD-202 method 213
Vibration IEC 60068-2-6, MIL-STD-202 method 204
Humidity IEC 60068-2-78, MIL-STD-202 method 103
UL/CSA Approvals UL1077, UL489A, CSA C 22.2
Other approvals DIN EN 60934/60947-2, CCC
Approvals – Rail EN-45545, NFF, IEC, ASTM, Bombardier SMP, Boeing BSS, SNCF

Dimensions

Poles                                                                    1-4 poles
Dimensions WxHxD (per pole) 19 x 51 x 49.5 mm (0.75” x 2.01” x 1.95”)
Weight per pole 65 grams (0.14 lb)

Mounting, Handle, Terminals

Mounting styles                               Front, Snap-in, DIN adapt
Handle Toggle, rocker, metal sealed
Power terminals Fast-on, screw terminals, PCB
Power connection Rear
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