O tipo CH da Eaton é típico entre os disjuntores modernos, pois o disparo comum multipolar é realizado por um mecanismo interno, e não pelo empate da alça. Isso é notado no catálogo da Eaton na descrição das especificações do disjuntor tipo CH (página V1-T1-31 do catálogo da Eaton, ênfase minha):
Product Description
Quick-make, quick-break switch mechanism combined with inverse time element tripping operation and trip-free handle design. Type CH circuit breakers trip to the OFF position, eliminating nuisance callbacks. The CHF family also includes a trip flag to differentiate between a trip and the breaker being turned off. The thermal-magnetic trip curve avoids nuisance tripping on mild overloads while reacting almost instantaneously to severe short-circuit conditions. Multipole breakers have internal common trip connection to operate all poles simultaneously. Handles are marked with ON-OFF indication and ampere rating of the breaker.
e na nota de rodapé 2 na tabela de acessórios (página V1-T1-38):
- Handle ties: typically used to join two similar independent single-pole breakers to form a two-pole noncommon trip breaker.
Isso significa que a combinação de dois disjuntores tipo pólo CH e um empunhadura é utilizável apenas para circuitos de somente 240V ou 120V conforme NEC 240.15 (B) (1) e 240.15 (B) (2):
(B) Circuit Breaker as Overcurrent Device. Circuit breakers shall open all ungrounded conductors of the circuit both manually and automatically unless otherwise permitted in 240.15(B)(1), (B)(2), (B)(3), and (B)(4).
(1) Multiwire Branch Circuits. Individual single-pole circuit breakers, with identified handle ties, shall be permitted as the protection for each ungrounded conductor of multi-wire branch circuits that serve only single-phase line-to-neutral loads.
(2) Grounded Single-Phase Alternating-Current Circuits. In grounded systems, individual single-pole circuit breakers rated 120/240 volts ac, with identified handle ties, shall be permitted as the protection for each ungrounded conductor for line-to-line connected loads for single-phase circuits.
Quanto às classificações do disjuntor, a linha CH também cobre você. Todos os disjuntores de pólo único CH, CHF, CHT, CH-HID, CHP, CH-M50, CH-HM e CHP-HM são classificados como 120 / 240VAC, portanto, eles são listados para em circuitos de fase dividida apenas em 240VAC.
Além disso, o Guia de marcação de disjuntores UL indica no parágrafo 40 que
An external handle tie alone does not qualify as a common trip mechanism — a breaker of this type is marked to indicate it is an independent trip breaker.