An electrical connection terminal includes: a connection terminal housing having a conductor insertion opening; a busbar arranged in the connection terminal housing; a spring element rotatably mounted in the connection terminal housing and pivotable into an open position and into a closed position, a conductor inserted into the conductor insertion opening being clampable against the busbar by the spring element in the closed position; and an actuation element rotatably mounted in the connection terminal housing and by which the spring element can be actuated for transfer into the open position and into the closed position. The actuation element includes a base body, which has a tool insertion opening, and an actuation arm. The base body and the actuation arm are formed in two parts, the actuation arm being formed pivotally movable relative to the base body.

A terminal connecting mechanism includes a plate spring, an insulating housing having an accommodating portion to accommodate a fixed portion and an elastic portion of the plate spring, and a terminal electrode portion disposed in the accommodating portion. The accommodating portion includes a first opening to allow a conductor portion of an electric wire to be inserted into the accommodating portion, an electric wire insertion guide wall disposed from the first opening along an insertion direction of the electric wire, to guide the conductor portion, an inclined wall facing the electric wire insertion guide wall and being inclined toward the electric wire insertion guide wall along the insertion direction of the electric wire, wherein the fixed portion is fixed to the inclined wall, and a second opening to allow a jig to be inserted into the accommodating portion, thereby canceling contact between the elastic portion and the conductor portion.

An electronic-component-equipped terminal block includes a terminal block including first and second through holes provided in a front wall; an electronic component including a component body first and second leads; and an electrically insulating attachment assistance tool. The attachment assistance tool includes a base portion arranged outside a housing such that a rear surface thereof abuts against the front wall; and first and second insertion portions protruding from the rear surface of the base portion to be thereby inserted into the first and second through hole, respectively. The attachment assistance tool is provided with a first passage portion through which the first lead is inserted, and a second passage portion through which the second lead is inserted, and a receiving portion that receives and accommodates a rear portion of the component body is provided at a front-side position.

A circuit breaker housing for holding a switching device unit and a number of connection contacts for a connection line and/or a busbar. The housing has a first housing part and a second housing part. In the joined, assembled state, the housing parts form a front side and a rear side opposite said front side and at least one connection side and end faces located opposite one another. A holding chamber for a connection module having one of the connection contacts is provided on the front side and/or on at least one of the connection sides.