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Fuses - Operation in UL-cUL Regions

Valid for UL and CSA regions.

Power Supply

Device Fuse class Voltage rating /
Interrupting rating
Max.
Ampere rating
Example class J
Cooper Bussmann
Example class J
Ferraz Shawmut
AKD-x00306 J 600VAC / 200kArms 10A (Time-Delay) LPJ101 / DFJ102 AJT101 / HSJ102
AKD-x00606 J 600VAC / 200kArms 15A (Time-Delay) LPJ151 / DFJ152 AJT151 / HSJ152
AKD-x01206 J 600VAC / 200kArms 15A (Time-Delay) LPJ151 / DFJ152 AJT151 / HSJ152
AKD-x02406 J 600VAC / 200kArms 30A (Time-Delay) LPJ301 / DFJ302 AJT301 / HSJ302
AKD-x00307 J 600VAC / 200kArms 6A (Time-Delay) LPJ61 / DFJ62 AJT61 / HSJ62
AKD-x00607 J 600VAC / 200kArms 10A (Time-Delay) LPJ101 / DFJ102 AJT101 / HSJ102
AKD-x01207 J 600VAC / 200kArms 15A (Time-Delay) LPJ151 / DFJ152 AJT151 / HSJ152
AKD-x02407 J 600VAC / 200kArms 30A (Time-Delay) LPJ301 / DFJ302 AJT301 / HSJ302
S303 RK5, CC, J, T 600VAC / 200kArms 6A (Time-Delay) LPJ61 / DFJ62 AJT61 / HSJ62
S306 RK5, CC, J, T 600VAC / 200kArms 10A (Time-Delay) LPJ101 / DFJ102 AJT101 / HSJ102
S310 RK5, CC, J, T 600VAC / 200kArms 10A (Time-Delay) LPJ101 / DFJ102 AJT101 / HSJ102
S341 RK5, CC, J, T 600VAC / 200kArms 6A (Time-Delay) LPJ61 / DFJ62 AJT61 / HSJ62
S343 RK5, CC, J, T 600VAC / 200kArms 6A (Time-Delay) LPJ61 / DFJ62 AJT61 / HSJ62
S346 RK5, CC, J, T 600VAC / 200kArms 10A (Time-Delay) LPJ101 / DFJ102 AJT101 / HSJ102
S403M RK5, CC, J, T 600VAC / 200kArms 20A (Time-Delay) LP201 / DFJ202 AJT201 / HSJ202
S406M RK5, CC, J, T 600VAC / 200kArms 20A (Time-Delay) LP201 / DFJ202 AJT201 / HSJ202
S443M RK5, CC, J, T 600VAC / 200kArms 20A (Time-Delay) LP201 / DFJ202 AJT201 / HSJ202
S446M RK5, CC, J, T 600VAC / 200kArms 20A (Time-Delay) LP201 / DFJ202 AJT201 / HSJ202
S601 RK5, CC, J, T 600VAC / 200kArms 6A (Time-Delay) LPJ61 / DFJ62 AJT61 / HSJ62
S603 RK5, CC, J, T 600VAC / 200kArms 6A (Time-Delay) LPJ61 / DFJ62 AJT61 / HSJ62
S606 RK5, CC, J, T 600VAC / 200kArms 10A (Time-Delay) LPJ101 / DFJ102 AJT101 / HSJ102
S610 RK5, CC, J, T 600VAC / 200kArms 10A (Time-Delay) LPJ101 / DFJ102 AJT101 / HSJ102
S614 RK5, CC, J, T 600VAC / 200kArms 20A (Time-Delay) LP201 / DFJ202 AJT201 / HSJ202
S620 RK5, CC, J, T 600VAC / 200kArms 20A (Time-Delay) LP201 / DFJ202 AJT201 / HSJ202
S640 RK5, CC, J, T 600VAC / 200kArms 50A (Time-Delay) LP501 / DFJ502 AJT501 / HSJ502
S670 RK5, CC, J, T 600VAC / 200kArms 80A (Time-Delay) LP801 / DFJ802 AJT801 / HSJ802
S701 RK5, CC, J, T 600VAC / 200kArms 6A (Time-Delay) LPJ61 / DFJ62 AJT61 / HSJ62
S703 RK5, CC, J, T 600VAC / 200kArms 6A (Time-Delay) LPJ61 / DFJ62 AJT61 / HSJ62
S706 RK5, CC, J, T 600VAC / 200kArms 10A (Time-Delay) LPJ101 / DFJ102 AJT101 / HSJ102
S712 RK5, CC, J, T 600VAC / 200kArms 15A (Time-Delay) LPJ151 / DFJ152 AJT151 / HSJ152
S724 RK5, CC, J, T 600VAC / 200kArms 30A (Time-Delay) LPJ301 / DFJ302 AJT301 / HSJ302
S748 RK5, CC, J, T 600VAC / 200kArms 60A (Time-Delay) LP601 / DFJ602 AJT601 / HSJ602
S772 RK5, CC, J, T 600VAC / 200kArms 80A (Time-Delay) LP801 / DFJ802 AJT801 / HSJ802

1 time-delay fuse for the line protection (overload protection)
2combination of line protection fuse and semiconducter fuse for line and device protection

Hints for cross section change from mains supply to motor can be found on page UL cross section

Fuses

You must use fuse classes RK5, CC, J or T with a 600VAC voltage rating and 200kArms interrupting rating. The fuse must be UL and CSA listed, UR recognized is not sufficient.

Automatic Circuit Breakers

There is no UL approved automatic circuit breaker for fuse classes RK5, CC, J or T. If automatic circuit breakers mare used in a system, which will be operated in UL / cUL regions, then the system must be inspected.

Fuse Holder

in addition to the standard fuse blocks there are finger safe fuse holder according to IEC 60529.

Examples:
Bussmann: CH Series Modular Fuse Holders, fuse size 0 to 30A class J, 3 poles: CH30J3
Ferraz: Ultrasafe Fuse holders, fuse size 0 to 30A class J, 3 poles: US3J3I

24V Supply

The description below delivers just examples for 24V fuse applications. It shows some possible applications only.

The required current values and the allowed wire cross sections for 24Vdc supply are described in the servo amplifier's instructions manuals. The 24V supply inputs are secures internally with 4A fuses. Therefore the external fuses only protect the lines.

Fuses

Micro fuse 6,3x32mm
Fuse holders integrated to series terminal blocks (35 mm standard rail),
e.g. from company Phoenix Contact: 4ST-HESI (6.3x32mm)

Automatic Circuit Breakers

ABB delivers special automatic circuit breakers for 60Vdc according to UL489 for Branch Circuit Protection:
Families S201 DC-k and S201 DC-Z with or without integrated auxiliary contact. These automatic circuit breakers for Branch Circuit Protection are developed especially for switching power supplies with short circuit limitation for selectively protection.

Important: observe the manufacturer's application notes sales information!!!
If switching power supplies are used for the 24V supply, you must consider, that these power supplies with short circuit limitation may be react as fast to a short circuit (typical <100ms), that fuses and automatic circuit breakers may not react and therefore a selectively protection isn't ensured any more.

Over Current Protection

Electronic over current protection devices for 24Vdc supply voltage are developed especially for selectively protection for use with switching power supplies with short circuit limitation.
Examples are:
Electronic over current protection ESX10-T from company E-T-A
and the SITOP-select series of SIEMENS AG.

Brake Resistor

Minimum wire cross section of the connection between servo amplifier, fuse and external brake resistor must be ensured, see table below:

Rated voltage mains supply Voltage rating of the DC fuse Ampere Rating of the DC Fuse
S303 - S310 S341 - S346 S403M - S406M S443M - S446M S601 - S603 S606 - S620 S640 S670 S701 - S712 S724 S748 S772
110/115V min. DC 250VDC 6A - 6A - - - - - 10A 15A - -
230V min. DC 250VDC 6A 6A 6A 6A 6A 10A 20A 30A 20A 30A/32A 125A 125A
400V
min. DC 440VDC - 6A - 6A 6A 10A 20A 30A 40A 50A 125A 125A
480V 600VDC - 1000VDC - 6A - 6A 6A 10A 20A 30A 40A 50A 125A 125A
min. wire cross section - 1,5mm2 1,5mm2 1.5mm2 1.5mm2 1,5mm2 1,5mm2 10mm2 10mm2 1,5mm2 1,5mm2 35mm2 35mm2

Fuse Type

Bussmann:
up to 50A: FWP-xxA14F, Size 14x51mm with 800Vdc UL approval
up to 100A: FWP-zzzA22F, Size 22x58mm with 500Vdc UL approval

The fuses do not protect the brake resistor from thermal overload. this supervision is done by the amplifier's software, if the parameterizing is correct. The fuses shall protect from short circuit and earth short circuit!

Fuse Holder

Bussmann: CH142D, CH222B

Intermediate Circuit (DC Bus)

Fuse type

Bussmann: FWP-50A14F, Size 14x51mm with 800Vdc UL approval

Fuse holder

Bussmann: CH142D