Moulded-case circuit breakers from 1600 A to 3200 A
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Moulded-case circuit breakers from 1600 A to 3200 A 1. General The high-current moulded-case circuit breakers shall comply with the general rules of IEC 60947 – 1 and 2 or standards derived from the latter (VDE 0660 ; BS4752 ; UTE 63120 ). Versions complying with UL 489 shall also be available. The high-current moulded-case circuit breakers shall belong to category B as defined in the general rules mentioned above. Certificates attesting to compliance with these rules shall be established taking into account the following performance levels for the test sequences: service breaking capacity (Ics) equal to at least 75% of the rated ultimate breaking capacity (Icu) and a rated short-time withstand current (Icw) of 30 kA / 0.5 s. The rated ultimate breaking capacity (Icu) of each high-current moulded-case circuit breaker shall be equal to at least the value of the short-circuit current (Isc) at the point of installation on the electric circuit, unless the upstream circuit breaker makes it possible to ensure coordination (as defined in Appendix A of IEC 60947-2); in this case, the coordination between the two circuit breakers shall be confirmed and guaranteed by tests. The high-current moulded-case circuit breakers shall have a rated operational voltage of 690V AC (50/60Hz). The high-current moulded-case circuit breakers shall have a rated insulation voltage of 750V AC (50/60Hz). The high-current moulded-case circuit breakers shall be available in switch-disconnector versions. The high-current moulded-case circuit breakers shall be suitable for reverse feed without any reduction in performance up to 500 V CA. The high-current moulded-case circuit breakers shall be available in 3-pole or 4-pole (neutral protection) versions. On 4-pole circuit breakers, a 3-position switch shall be provided to set neutral protection to any of the following levels: unprotected neutral (4P3D), half-protected neutral (4P3D+N/2) or fully protected neutral (4P4D). 2. Construction and operation The operating mechanism of the moulded-case circuit breakers shall be of the fast make and fast break type. Tripping on a fault shall be mechanically independent of the operating handle. The operating mechanism shall be designed to operate all poles of the circuit breaker simultaneously for making, breaking and tripping. The moulded-case circuit breakers shall be actuated by a handle that clearly indicates the three fundamental positions: ON, OFF and TRIPPED. The operating mechanism shall be designed in such a way that the position of the operating handle of the circuit breaker indicates the real position of the main contacts. The high-current moulded-case circuit breakers shall be designed to allow locking in OFF (open) position (if required) by keylocks or padlocks. 3. Protection functions of the control unit General The protection functions shall be provided by a control unit powered by a transformer located within the case. The operation of the tripping mechanism shall require no external power source. The control unit shall be interchangeable on site for adaptation to changes in the installation. Sensors shall be of the non-magnetic or Rogosky type for accurate current measurements. The control unit shall measure the true rms value of the current. Characteristics Long-time protection with an adjustable current setting and time delay Short-time protection with an adjustable pick-up and time delay Instantaneous protection adjustable up to 15 times the rated current with an OFF position Earth-fault protection (if required) with an adjustable pick-up and time delay Moulded-case circuit breakers from 1600 A to 3200 A These additional chapters correspond to specific needs Communication The circuit breaker shall be capable of communicating the following data via a bus: Circuit-breaker status (open/closed, connected/disconnected/test, tripped on a fault, ready to close) Control-unit settings Tripping causes The measurements processed by the control unit Communications functions shall be independent of the control unit. End-of-life Environmental considerations and processing of materials at end of service life. The manufacturer shall provide instructions on the removal, dismantling and processing of circuit-breaker materials at the end of service life. Moulded-case circuit breakers from 630 A to 1600 A 1. General The moulded-case circuit breakers shall comply with the general rules of IEC 60947 – 1 and 2 or standards derived from the latter (VDE 0660 ; BS4752 ; UTE 63120 ). Versions complying with UL 489 shall also be available. The moulded-case circuit breakers (except for current-limiting circuit breakers) shall belong to category B as defined in the general rules mentioned above. Certificates attesting to compliance with these rules shall be established taking into account the following performance levels for the test sequences: service breaking capacity (Ics) equal to at least 50% of the rated ultimate breaking capacity (Icu) and a rated short-time withstand current (Icw) of 25 kA / 0.5 s (except for current-limiting circuit breakers). The rated ultimate breaking capacity (Icu) of each moulded-case circuit breaker shall be equal to at least the value of the short-circuit current (Isc) at the point of installation on the electric circuit, unless the upstream circuit breaker makes it possible to ensure coordination (as defined in Appendix A of IEC 60947-2); in this case, the coordination between the two circuit breakers shall be confirmed and guaranteed by tests. The moulded-case circuit breakers shall have a rated operational voltage of 690V AC (50/60Hz). The moulded-case circuit breakers shall have a rated insulation voltage of 750V AC (50/60Hz). The moulded-case circuit breakers shall be available in switch-disconnector versions. The moulded-case circuit breakers shall be designed for vertical, horizontal or flat mounting without any reduction in performance. The moulded-case circuit breakers shall be suitable for reverse feed without any reduction in performance up to 500 V CA. The moulded-case circuit breakers shall be available in fixed or withdrawable versions and in 3-pole or 4-pole (neutral protection) versions. 2. Construction and operation The operating mechanism of the moulded-case circuit breakers shall be of the fast make and fast break type. Tripping on a fault shall be mechanically independent of the operating handle. The operating mechanism shall be designed to operate all poles of the circuit breaker simultaneously for making, breaking and tripping. The moulded-case circuit breakers shall be actuated by a handle that clearly indicates the three fundamental positions: ON, OFF and TRIPPED. If required, the circuit breaker shall be equipped with a rotary handle. The operating mechanism shall be designed in such a way that the position of the operating handle of the circuit breaker indicates the real position of the main contacts, even if the circuit breaker is equipped with a rotary handle. The moulded-case circuit breakers shall provide double insulation of the front face to allow on-site installation of auxiliaries without de-energising the installation. All electrical auxiliaries and accessories such as voltage releases, (shunt or undervoltage type) and auxiliary contacts shall be designed for easy on-site installation. All electrical auxiliaries shall be equipped with terminal blocks and shall be of the snap-in type. 3. Protection functions of the control unit General The protection functions shall be provided by a control unit powered by a transformer located within the case. The operation of the tripping mechanism shall require no external power source. The control unit shall be interchangeable on site for adaptation to changes in the installation. Sensors shall be of the non-magnetic or Rogosky type for accurate current measurements. The control unit shall measure the true rms value of the current. Characteristics Long-time protection with an adjustable current setting and time delay Short-time protection with an adjustable pick-up and time delay Instantaneous protection adjustable up to 15 times the rated current with an OFF position Earth-fault protection (if required) with an adjustable pick-up and time delay Control and monitoring functions Moulded-case circuit breakers from 630 A to 1600 A The following control and monitoring functions shall be built into the control units: Load monitoring A LED shall indicate the load level – from 90% to 105% load (with respect to the long-time setting), an orange LED shall be illuminated. – above 105%, the orange LED shall flash. Testing A test connector shall be provided on the control unit to allow complete testing by an external test unit. Thermal memory The control unit shall optimise protection of downstream cables and equipment in the event of repeated overloads or earth faults by storing the temperature-rise data in memory. Moulded-case circuit breakers from 630 A to 1600 A These additional chapters correspond to specific needs Communication The circuit breaker shall be capable of communicating the following data via a bus: Circuit-breaker status (open/closed, connected/disconnected/test, tripped on a fault, ready to close) Control-unit settings Tripping causes The measurements processed by the control unit It shall be possible to set the circuit breaker remotely: Adjustment over the range imposed by the settings made on the front of the control unit Communications functions shall be independent of the control unit. End-of-life Environmental considerations and processing of materials at end of service life. The manufacturer shall provide instructions on the removal, dismantling and processing of circuit-breaker materials at the end of service life.
