Miniature circuit breakers
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1 Miniature circuit breakers Din-T series ka MCB Standard AS/NZS 898 ) Approval No. N78 Short circuit breaking capacity Amps Current range Amps,, and pole Sealable and lockable handle Modular design Available in curve type B, C and D Mounts on CD chassis (0 A and 55 A) pole module DTCB pole In (A) C Curve 5- I n DTCB5C DTCBC DTCBC DTCBC DTCBC DTCBC DTCBC DTCBC DTCBC DTCB0C DTCBC DTCBC DTCB0C DTCB50C DTCBC Short circuit capacity ka In (A) P P P P Use at DC Short circuit Max voltage P ka 8 V DC 0 V AC 0/5 V AC 0/5 V AC 0/5 V AC P ) 0 ka V DC pole modules DTCB05C DTCB0C DTCB0C DTCB0C DTCB0C DTCBC DTCBC DTCBC DTCB0C DTCBC DTCBC DTCB0C DTCB0C DTCBC Notes: ) A range of UL standard MCBs is available on indent. (ref DTCBULO C). ) pole MCB connected in series. The line side is the OFF (bottom) side of the MCB, and connects to CD chassis tee-offs. i Available on indent only.
2 Miniature circuit breakers Din-T series ka MCB (cont.) pole modules In (A) i i i C Curve 5- In DTCB05C DTCB0C DTCB0C DTCB0C DTCB0C DTCBC DTCBC DTCBC DTCB0C DTCBC DTCBC DTCB0C DTCB50C DTCBC DTCB - pole types pole modules ) DTCB0C DTCBC i DTCBC DTCBC DTCB0C DTCBC DTCBC DTCB0C DTCB50C DTCBC Notes: ) All poles include overcurrent and short circuit protection. i Available on indent only.
3 Innovators in Protection Technology Characteristics according to BS EN 0898 Miniature Circuit Breakers are intended for the protection of wiring installations against both overloads and short-circuits in domestic or commercial wiring installations where operation is possible by uninstructed people Tripping characteristic curves Rated short-circuit breaking capacity (Icn) Is the value of the short-circuit that the MCB is capable of withstanding in the following test of sequence of operations: O-t-CO. After the test the MCB is capable, without maintenance, to withstand a dielectric strength test at a test voltage of 900 V. Moreover, the MCB shall be capable of tripping when loaded with.8 In within the time corresponding to.55 In but greater than 0.s. Service short-circuit breaking capacity (Ics) Is the value of the short-circuit that the MCB is capable of withstanding in the following test of sequence of operations: O-t-CO-t-CO. After the test the MCB is capable, without maintenance, to withstand a dielectric strength test at a test voltage of 500 V. Moreover, the MCB shall not trip at a current of 0.9 In. The MCB shall trip within h when current is. In. Magnetic release An electromagnet with plunger ensures instantaneous tripping in the event of short-circuit. The NHP Din-T range has different types, following the current for instantaneous release: types B, C and D curve. Icn (A) B C D Test current x In 5 x In 5 x In x In Tripping time 0.<t<5 s (In A) 0.<t<90 s (In> A) t<0. s 0.<t<5 s (In A) 0.<t<0 s (In> A) t<0. s Applications Only for resistive loads eg: electrical heating water heater stoves. Usual loads such as: lighting socket outlets small motors x In 0.<t< s(**) (In A) Control and protection of 0 x In 0.<t<8 s (In> A) circuits having important transient inrush currents t<0. s (large motors) O C t - Represents an opening operation - Represents a closing operation followed by an automatic opening. - Represents the time interval between two successive short-circuit operations: minutes. The relation between the rated short-circuit capacity (Icn) and the rated service short-circuit breaking capacity (Ics) shall be as follows: Icn (A) 000 > > 000 Ics (A) Icn min Icn min In both sequences all MCBs are tested for emission of ionized gases during short-circuit (grid distance), in a safety distance between two MCBs of 5 mm when devices are installed in two different rows in the enclosure. This performance allows the use of any NHP/Terasaki enclosure. Thermal release The release is initiated by a bimetal strip in the event of overload. The standard defines the range of releases for specific overload values. Reference ambient temperature is 0 C. Test current. x In.5 x In.55 x In Tripping time t h (In A) t h (In > A) t < h (In A) t < h (In > A) s < t < 0 s (In A) s < t < 0 s (In > A)
4 Tripping curves according to EN 0898 The following tables show the average tripping curves of the Terasaki Din-T MCBs based on the thermal and magnetic characteristics. Curve C
5 Din-T ka C curve Innovators in Protection Technology
6 Influence of ambient air temperature on the rated current The maximum value of the current which can flow through an MCB depends on the nominal current of the MCB, the conductor cross-section and the ambient air temperature. The values shown in the table below are for devices in free air. For devices installed with other modular devices in the same switchboard, a correction factor (K) shall be applied relative to the mounting situation of the MCB, the ambient temperature and the number of main circuits in the installation. The thermal calibration of the MCBs was carried out at an ambient temperature of 0 C. Ambient temperatures different from 0 C influence the bimetal and this results in earlier or later thermal tripping. No of devices K ) or or 5 or 9 > Calculation example Within a distribution board consisting of eight Pole, A, C curve type MCBs, with an operating ambient temperature of 5 C, which is the highest temperature the MCB can operate at without unwanted tripping? Calculation The correction factor K = 0.7, for use in an eight circuit installation: A x 0.7 =. A As the MCB is working at 5 C it shall be given another factor (90 % = 0.9): In at 5 C = In at 0 C x 0.9 =. A x 0.9 =. A. Note: ) Applicable for MCBs working at maximum rated currents. : P (single pole) : mp (multi-pole)
7 Effects of frequency on the tripping characteristic All the MCBs are designed to work at frequencies of 50-0 Hz, therefore to work at different values, consideration must be given to the variation of the tripping characteristics. The thermal tripping does not change with variation of the frequency but the magnetic tripping values can be up to 50 % higher than the ones at 50-0 Hz. Tripping current variation Limitation curves Let-through energy I t The limitation capacity of an MCB in short-circuit conditions, is its capacity to reduce the value of the let-through energy that the short-circuit would be generating. Peak current Ip Is the value of the maximum peak of the short-circuit current limited by the MCB. 0 Hz 0 Hz 00 Hz 00 Hz 00 Hz....5 Power losses The power losses are calculated by measuring the voltage drop between the incoming and the outgoing terminals of the device at rated current. Power loss per pole In (A) Voltage drop (V) Energy loss (W) Resistance (mohm) See following pages
8 Use of standard MCB for DC use For MCBs designed to be used in alternating current but used in installations in direct current, the following should be taken into consideration: For protection against overloads it is necessary to connect the two poles to the MCB. In these conditions the tripping characteristic of the MCB in direct current is similar to alternating current. Use in DC selection table For protection against short-circuits it is necessary to connect the two poles to the MCB. In these conditions the tripping characteristic of the MCB in direct current is 0% higher than the one in alternating current. Use of special MCB Din-T DC for DC use. (UC = Universal current) For MCBs designed to work in both alternating and direct current, it is necessary to respect the polarity of the terminals since the device is equipped with a permanent magnet. Series Rated current (A) 8 V pole Icu (ka) V poles in series Icu (ka) 0 V pole Icu (ka) 0 V poles in series Icu (ka) Din-T A Installation of Din-T DC MCBs in direct current
9 Text for specifiers Innovators in Protection Technology MCB Series Din-T According to EN 0898 standard For DIN rail mounting according to DIN EN 500; EN 500; future EN 075; IEC 075 (top hat rail 5 mm) Grid distance 5 mm Working ambient temperature from - C up to +50 C Approved by CEBEC, VDE, KEMA, IMQ. pole is a module of 8 mm wide Nominal rated currents are: 0.5/////////0///0/50/ A Tripping characteristics: B,C,D (B curve Din-T only). Number of poles: P, P+N, P, P, P+N, P The short-circuit breaking capacity is: /k A, energy limiting class Terminal capacity from up to 5 mm rigid wire or.5 up to mm flexible wire. Screw head suitable for flat or Pozidrive screwdriver Can be connected by means of both pin or fork busbars The toggle can be sealed in the ON or OFF position Rapid closing Both incoming and outgoing terminals have a protection degree of IP 0 and they are sealable Isolator function thanks to Red/Green printing on the toggle. Maximum voltage between two phases; 0 V~ Maximum voltage for utilisation in DC current: 8 V P and V P Two position rail clip Mechanical shock resistance 0 g (direction x, y, z) minimum 8 shocks 5 ms half-sinusoidal acc. to IEC Vibration resistance: g (direction x, y, z) minimum 0 min. according to IEC Extensions can be added on both left or right hand side Auxiliary contact Shunt trip Undervoltage release Motor operator Panelboard switch Add-on RCD can be coupled.
10 Series Standards (Aust / NZ / International) Tripping characteristics Nominal current A Calibration temperature C Number of poles (# mod) Neutral pole protected Nominal voltage Un AC P V P/ P V DC P ) V DC P (in series) ) V DC Frequency Hz Hz Hz Maximum service voltage Ubmax between two wires V Minimum service voltage Ubmin V Selectivity class (IEC 0898) Isolator application IEC 097- Rated insulation voltage Pollution degree V Pollution degree V Impulse withstand test voltage kv Insulation resistance mohm Dielectric rigidity kv Vibration resistance (in x, y, z direction) (IEC 77/.) Endurance Electrical at Un, In mechanical Utilisation category (IEC 097-) Protection degree (outside / inside, in enclosure with door) Self-extinguish degree (according to UL9) Tropicalisation (according to IEC 008- / DIN 00) C/RH Operating temperature C Storage temperature C Terminal capacity Rigid cable min/max (top) mm Flexible cable min*/max (top) mm Rigid cable min/max (bottom) mm Flexible cable min*/max (bottom) mm (* Flexible cable 0.75//.5 mm with cable lug) Torque Nm Add-on devices Auxiliary contacts (side add-on) UVT Shunt trip Motor operator Panelboard switch Busbar systems Pin (top/bottom) Fork (top/bottom) Accessories Dimensions, weights, packaging (HxDxW) 8x8xW mm/mod. Weight/mod. g Package mod. Short-circuit capacity AC (ka) Icn P 0/00 V P 0/00 V P/ P 0/00 V Ics (service) Icu (ultimate) P 7 V 0 V 5 V P 7 V 0 V 5 V P, P 0 V 5 V 0 V Ics (service) NEMA AB (0/0V) Short-circuit capacity DC (ka) Icu (ultimate) P 0 V 0 V P V 0 V Ics (service) IEC 0898 IEC 097- IEC 097- Din-T AS/NZS 898 IEC 0898 B, C, D B(-), C/D(0.5-) 0 /// 0/ /0 DC: magn.trip +0% 00: magn.trip +50% 0/0; 5/0 ; 500 0,000.5 g,000 0,000 A IP 0/IP 0 V +55 C/95 % RH -/+55-55/+55 /5 0.75/ /5 0.75/.5 / -/ 8 0 AS/NZS % Icn % Icu % Icu Notes Refer pages -, for information on SAFE-T MCBs. ) Preferred values of rated control supply voltage (IEC ): V, 8 V, V, V, 0 V ) 0.5- A/- A/-0 A/50- A ) ( V DC) ) (0 V DC) 5 ) On request.
11 Din-T MCBs + RCDs Technical data Miniature circuit breakers - Din-T Dimensions in mm.
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