Mini-breaker TCOs reset when the following conditions are met:
• The ambient temperature has dropped by 10 °C below the minimum trip temperature
• Power to the TCO has been cycled (off/on)
Product Dimensions
2.7 ± 0.1
(.106 ± .004)
5.8 ± 0.1
(.228 ± .004)
2.7 ± 0.1
(.106 ± .004)
Agency Recognition
Description
0.1 ± 0.01
(.004 ± .0004)
UL, cUL
TUV
File Number: E215638
File Number: R50188566
2.5 ± 0.1
(.098 ± .004)
2.5 ± 0.1
(.098 ± .004)
3.75 ± 0.1
(.148 ± .004)
1.15
MAX.
(.045)
How to Order
LC 72 A Y - 1
MM
DIMENSIONS:
(INCHES)
Series Designator
Trip Temperature (±5 °C)
• 72
• 82
• 77
• 85
Arm Material
A = Cu Alloy
Product Structure
COVER
PLATE
ARM
ARM
TERMINAL
COVER
CONTACT
Manufacturer’s Internal Code
Terminal Type
(with/without Projection & Terminal Length)
PROJECTION
BASE
BIMETAL DISC
PTC
BASE
TERMINAL
PROJECTION
AVAILABLE WITH AND WITHOUT PROJECTIONS.
* RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
** Bourns considers a product to be “halogen free” if (a) the Bromine (Br) content is 900 ppm or less; (b) the Chlorine (Cl) content is 900 ppm or less; and (c) the total Bromine (Br)
and Chlorine (Cl) content is 1500 ppm or less.
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
LC Series Breaker (Thermal Cutoff Device)
Typical Performance
Current vs. Temperature Curves
10
10
9
8
7
LC85AY-1 (Low 80 °C average)
LC82AY-1 (Low 77 °C average)
LC77AY-1 (Low 72 °C average)
LC72AY-1 (Low 67 °C average)
Current (A)
6
5
4
3
2
1
0
20
30
40
50
60
70
80
Temperature (°C)
Place test samples in oven at 25 ℃, 40 ℃, 60 ℃ and 70℃ and increase current flow through the sample at a rate of 0.1 A/minute and record
current value when sample trips.
Operation
NORMAL CIRCUIT
CURRENT
EXCESSIVE
CURRENT
AND/OR
HEAT
CIRCUIT
AFTER OPENING
VERY LOW CURRENT
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
LC Series Breaker (Thermal Cutoff Device)
Wiring Recommendations
This is not a surface mount device for reflow soldering. Therefore, Ni tab wiring should be accomplished by either resistance or laser welding.
Outer Box ....................................................................................................................................50,000 pcs. max. (up to 10 inner boxes)
Asia-Pacific:
Tel: +886-2 2562-4117 • Email: asiacus@bourns.com
EMEA:
Tel: +36 88 520 390 • Email: eurocus@bourns.com
The Americas:
Tel: +1-951 781-5500 • Email: americus@bourns.com
www.bourns.com
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
LC Series Breaker (Thermal Cutoff Device)
Caution when using Breaker
Before using the breaker, please fully read the
DESIGN AND HANDLING CAUTIONS
stated below to avoid breaker performance deterioration
and/or damage to the breaker body or terminal.
DESIGN CAUTIONS
1. Use within the electrical ratings specified in this data sheet. If used over the rating of voltage or current, ON-OFF life might be impacted
and contact may deteriorate due to breaker arm damage.
2. If used over the maximum electrical rating specified in this data sheet, the circuit may not open safely or operate properly. Please test your
device for any abnormalities and confirm that the breaker will open the circuit safely in your device.
3. Mount the breaker on your device where heat is the highest in order to transfer it effectively to the breaker.
4. If the breaker is affixed with an adhesive (resin, etc.), before proceeding, fully test, evaluate and verify that the adhesive presents no
negative effects on the breaker.
5. After the breaker is mounted, affix it so that the breaker body and terminals will not move. If not affixed properly, breaker resistance could
increase or contact could open due to stress during handling or vibration/shock during transportation.
6. Mount the breaker body and terminals in a straight and flat direction. If the body and terminals are mounted in a twisted condition, breaker
resistance could increase or create body damage.
7. If breaker is to be resin-molded, test and evaluate the application to determine whether the breaker can be used effectively.
8. The breaker cannot be used as a repetitive ON-OFF thermostat.
9. The breaker is not washable. Do not wash.
10. The breaker is not designed or warranted for flow, reflow or hand-soldering applications. If such application is required, you will need to
evaluate whether the breaker is suitable for your specific application.
11. When mounting and after mounting the breaker, do not apply supersonic vibration. Vibration and heat may cause breaker resistance
to increase or may cause body damage. If you plan to apply supersonic vibration after mounting the breaker, you will need to evaluate
whether the breaker is suitable for your specific application. The breaker is not designed or warranted to withstand supersonic vibration.
12. Do not use the breaker in the following environments:
a) Water, oil, chemical or organic solutions
b) Direct sunlight, outdoor exposure, dust
c) Dew condensation, where the breaker could get wet
d) Salt breeze, chlorine, hydrogen sulfide, ammonium, sulfide-oxidation, hydrogen chloride, and anywhere there is a possibility of
generating corrosive gas such as sulfurous acid gas
e) Strong static electric charge or electromagnetic wave
13. The breaker is not designed or tested for, and should not be used in, aerospace, airplane, nuclear, military, life-sustaining medical and
other related applications.
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
LC Series Breaker (Thermal Cutoff Device)
Caution when using Breaker (Continued)
HANDLING CAUTIONS
1.
2.
3.
Since the breaker body is composed of plastic parts, do not clamp or dent with tools as this could cause a resistance increase or body
damage.
Breaker terminals are thin copper-alloy with right angle edges. Handle carefully to avoid injury to fingers. Handling while wearing finger
cots and using tweezers is recommended.
When welding breaker terminals or mounting the breaker on a cell or PCM board, be careful to avoid placing excessive stress on the
breaker body and terminals. Excessive stress may cause a resistance increase or body damage. Please refer to the following cautions:
a) Do not apply more than 10 N moment to the breaker body (refer to Figure 1)
b) Do not apply more than 1.5 cN-m twist torque to the breaker body (refer to Figure 2)
c) Do not apply more than 20 N bending force to the breaker body (refer to Figure 3)
d) Do not apply more than 2.0 cN-m twist torque to the breaker terminals (refer to Figure 4)
e) Do not apply more than 2 N force to the breaker terminals (refer to Figure 5)
f)
4.
5.
Do not bend terminals more than 45 ° at root (refer to Figure 6)
g) Do not twist terminals more than 10 ° with the breaker body affixed.
In breaker body welding, normally there is direct welding (Figure 7) and series welding (Figure 8). In either case, use a suitable jig so that
stress will not exceed the limits stated above.
Pull-and-detach strength of the terminal welding should be to your own specification. If the welding result is controlled by resistance,
measurement should be made at a close point to the breaker body by “DC 4-point clip method” using a milliohm meter to ensure accuracy
(refer to Figure 9).
Avoid putting excessive stress as shown above in 3-a) to 3-g) when the jig is used for welding/additional processing.
Confirm the resistance value after each time an additional process is applied.
6.
7.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
45 °
45 °
Figure 6
45 °
45 °
Figure 7
Rod A
Figure 8
Rod A
Rod B
Rod B
Figure 9
Due to possible updates to safety standards and other reasons, there may be changes in
specifications for this data sheet without prior notification. Therefore, before design-in for
your application, please contact us for the most up-to-date specifications.
milliohm meter
REV. 05/18
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
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