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Home » Miniature Circuit Breakers
Miniature Circuit Breakers
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Newtech MCB's are among the best available designed with proven, trusted and reliable German Technology to provide enhanced operating safety, Installations for domestic, commercial and industrial applications. Some of the salient features of these MCB's are as below.
Construction :
Miniature Circuit Breakers are housed in injection moulded flame retardant, high strength thermo plastic material having high melting point, high dielectric strength and temperature with stand.
Trip free Mechanism i.e. the breaker trips internally even if the operating knob is held in ON position.

The Tripping Mechanism is thermal magnetic type :
» Finger Protection
MCB's are finger protected to IP 20 as per IS : 8828 : 1996 the live current carrying parts cannot be touched accidentially.

» Magnetic Protection
When overload values exceed the value specified for different characteristic curves i.e. B & C strong Magnetic field is induced which results into instantaneous tripping of MCB.

» Effective Quenching
Arc produced of contacts is rapidly pushed Magnetically into a 12 plates arc chamber where it is broken down effectively & cooled.

» Trip Free Mechanism
Trip free Mechanism ensure tripping of MCB even if the knob is kept in 'ON' position.

» Special Silver Alloy Contacts
The contacts are made out of special silver alloy inlaid strips which gives low contact resistance resulting in low voltage drop & hence very low power consumption and temperature rise. These contacts have very excellent anti weld properties.

» Thermal Protection
Small overloads are detected by fine calibrated Bimetal which deflects if the current is greater than the rated current and hence tripping the MCB.

» Dual Termination
The incoming terminals are designed for termination of Busbar as well as cable individually or simultaneously. Terminals are suitable for Cables upto 25mm².

Housing
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The housing of Newtech 10KA MCB is injection moulded from Special grade 30% GF, fire retardant UL94, V-O Polyester which is anti-tracking and non-Hygroscopic and can withstand high temperature.
Current Limiting Design
The current limiting design does not allow fault current to reach its peak |k/2 & cut it at a very low value (ld). This keeps let through energy very low which enables MCB to clear short circuit breaking capacity of 10KA effectively.





Salient Features :
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Technical Information

S.no Rating Newtech MCB's Power Loss (Watts) Maximum Permissible power Loss (Watts) as per IS : 8828/IEC 60898
1 6 1.2 3.0
2 7.5 1.7 3.0
3 10 2 3.0
4 16 2.5 3.5
5 20 3 4.5
6 25 3.5 4.5
7 32 4.5 6.0
8 40 5.5 7.5
9 63 7.5 13
Comparative Table

Rating B & C Type MCB's
6-32 A 40-63 A
As Per ISI Newtech As Per ISI Newtech
1.13 In Should not trip in 1 hour Does not trip in 1 hour Should not trip in 1 hour Does not trip in 1 hour
1.45 In Should trip in 1 hour Trips in 30 Min. Should trip in 1 hour Trips in 30 Min.
1.9 In Should trip in 1 hour Trips in 30 Min. 3.0 Trips in 30 Min.
2.55 In Trips in 60 Sec. Trips in 20 Sec. Trips in 120 Sec. Trips in 30 Sec.
3 In "B" Curve should not trips in 0.1 Sec. "B" Curve does not trips in 0.1 Sec. "B" Curve should not trips in 0.1 Sec. "B" Curve does not trips in 0.1 Sec.
5 In "B" Curve should trips in 0.1 Sec.
"C" Curve should trips in 0.1 Sec.		 "B" Curve trips in 0.04 Sec.
"C" Curve does not trips in 0.1 Sec.		 "B" Curve trips in 0.1 Sec.
"C" Curve should trips in 0.1 Sec.		 "B" Curve trips in 0.04 Sec.
"C" Curve does not trips in 0.1 Sec.
10 In "C" Curve should trips in 0.1 Sec. "C" Curve trips in 0.04 Sec. "C" Curve should trips in 0.1 Sec. "C" Curve trips in 0.04 Sec.
Technical Information

Standard Conformity IS : 8828 : 96
Types/Series B C
Rated Current (In) 6-63 A 6-63 A
Rated Voltage (AC) (Ue) 240 / 415 V 240 / 415 V
Rated Frequency (F) 50 Hz 50 Hz
Nos. of Poles *SP, *SPN, * DP, *TP, *TPN
Rate Short Circuit Breaking Capacity A 10000 A 1O000 A
Magnetic Release Selling (3-5) in (5-10)in
Rated Insulation Voltage (Ui) V 500 V 500 V
Electrical / Mechanical Endurance - -
(No, of operations) - -
1 ess than 32 A 20,000 20,000
More than 32 A 10,000 10,000
Terminal Capacity (max) Sq. mm 25 25
Vibration g 5 5
Shock 40 mm free fall 40 mm free fall
Protection Class IP 20 IP 20
Installation Position Optional Optional
Mounting Snap Fixing on 35 DIN Rail
Housing Moulded Flame Retardent Thermoplastic Material
Current Ratings 6,8,10,13, 16,20,25,32,40,50,63
Newtech MCB Selection Chart

S.no Appliances Capacity/Approx. Wattage at 240 V Single Phase Current Rating of MCB (Amps.) Type of MCB
1. Air Conditioners i) 0.5Ton-775 W 5 C
ii) 0.75Ton-upto 1200 W 7.5 C
iii) 1 Ton-upto 1.5 kW 10 C
iv) 1.5 Ton-upto 2.5 kW 16 C
v) 2 Ton-split unit upto 3.5 kW 20 C
2. Refrigerator i) 165 Ltrs. 1.5 C
ii) 285 Ltrs. 2 C
iii) 400 Ltrs. 3 C
iv) 581 Ltrs. 5 C
3. Washing Machine i) 300 Watts 2 C
ii) 1300 Watts (with heater) 7.5 C
iii) 1800 Watts (with heater) 10 C
iv) 2200 Watts (with heater) 16 C
4. Domestic Pump Set i) 0.5 H.P. 6 C
ii) 1 H.P. 10 C
ii) 2 H.P. 16 C
5. Water Heater (Storage or Instaneous Geyser) i) 1 KW 6 C
ii) 2 KW 10 B
iii) 3 KW 16 B
iii) 6 KW 32 B
6. Cooking Range 4500 Watts 25 B
7. Oven Cum Griller 1750 Watts 10 B
8. Oven Only 750 Watts 6 B
9. Microwave Oven 1000 Watts 6 B
10. Electric Kettle 1500 Watts 10 B
11. Room Heater i) 1000 Watts 6 B
ii) 2000 Watts 10 B
12. Iron i) 750 Watts 5 B
ii)1250 Watts 7.5 B



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