Then, then
Circuit Breakers 101
Suitable for your application.
The Circuit Breaker to Trip at the Given Current. The Widths of the Curves Indicate Typical Tolerances. It’s Recomgeded that You Consult A Data SHEET FOR MOREIREMATION.
Deteting Factors
, DERATING FACTORS MST Be Applied.
Circuit breaker on overload will be reduced; the reverse applies at low testures.
The Low End, Even DC Operation Can Cauting Ises with Extinguishing The Arc that Occurs when the contaments are sitting applications.
And Perhaps Even Mounting Position. Circuit Breaker ManuFacturers Provideo DABLES and Operating GuideLine in this this task. WHEN in Double.
Packaging
Standards and Safety Agencies
And qualification requirers.
Step-By-STEP Selection Procedure
parameters.
Step 1: Basic Electrical Parameters
a) What is the voltage? IS it ac or dc? If ac, What Frequency?
b) What is the normal loadurrent? Trip Current?
c) NUMBER of Poles and Type — Normally Open (n/o) or Normally Closed (N/C)?
d) Are Any Electrical Sepate Auxiliary Contacts NEEDED? N/OR N/C?
E) Required Trip Characteristic (See Time/Current Curves Above)
Step 2: Other Required Features
a) Mechanical form factor (E.G. DIN RAIL, Panel Mount, Standalone, ETC.), OR SIZE Constraint?
b) Connection Method?
c) AdDitional Features required?
Step 3: Operational Considerations
a) ENVIRONMENTAL C.
b) Required Safety Approvals
c) Industry-Spectry-Specific Requirements (E.G. Automotive, Aviation, Medical, Hazardous Operation, MIL STD, ETC.)
Design exmple
To Illustrate the Process, Here ’s a real-all design example.
blow (delay) and Fast-Acting Types.
Basic Electrical Parameters:
Operating voltage: 24VDC
Normal loadurrent: 10 @ 5A EACH
Number of point and type: Single Pole
Required Trip Characteristic: 100ms Trip Time (APPROXIMATELY) at 3 Times Rated Current to Replicate Performance of Fusesses
Other Required Features
Mechanical Form Factor: PCB Mount, Small Size (Approximately 1 Inch by 1 Inch)
Connection method: Solder Terminals
Additional Features Required: PROVIDE Indication of Tripped State (Auxiliary Contory/Alarm); Switchable; ResetTable
Operational consaturerations
ENVIRONMENTAL CONDINONS: High Shock and Vibration Specifications (Seismic Testing is Part of the Customer ’s Approval Process)
Enclosed Cabinet Installation with Temperant EXCURSIONS
Selection Process
Window, Ruling It Out as a POSSIBLE SOLUTION.
+70 rC Range; And is mounted subtyic circuit breaker on a symmetrical din rail that can be plugged into a PCB.
The Result was a very satisFied Customer.