* 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.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
AC Series Breaker (Thermal Cutoff Device)
Typical Performance
Current vs. Temperature Curves
40
35
30
AC72ABD (Low 67 °C average)
AC77ABD (Low 72 °C average)
AC82ABD (Low 77 °C average)
AC85ABD (Low 80 °C average)
AC90ABD (Low 85 °C average)
Current (A)
25
20
15
10
5
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Temperature (°C)
The above curves were derived from placing test samples in an oven at 25 ℃, 40 ℃, 60 ℃ and so on, increasing current flow through the
sample at a rate of 0.1 A/minute and recording the current value when the sample trips.
Product Structure
COVER
PLATE
ARM
ARM
TERMINAL
COVER
CONTACT
PROJECTION
BASE
BIMETAL DISC
PTC
BASE
TERMINAL
PROJECTION
AVAILABLE WITH AND WITHOUT PROJECTIONS.
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
AC 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 ....................................................................................................................................30,000 pcs. max. (up to 10 inner boxes)
Application Temperature Range
........................................... -30 ~ 100 °C
Circuit Diagram
NORMAL CIRCUIT
CIRCUIT
AFTER OPENING
Storage Conditions
1) The breaker must be stored in the original packaging (plastic bag or carton) with
the following conditions: ambient temperature of -10 to +40 °C, RH <75 % with no
radical temperature change, direct sunshine, excessive vibration or shock.
2) Avoid storage locations where there is a possibility of generating corrosive gas
such as from salt breeze, chlorine, hudrogen sulfide, ammonium, sulfide-oxidation,
hydrogen chloride, acetate, etc.
3) Storage period should be no longer than 24 months from date of shipment.
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.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
AC 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.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
AC 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 0.6 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. 06/18
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
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