JPS593479Y2 - Current limiter for thermal relay - Google Patents

Description

[Detailed explanation of the invention] This invention is designed to reduce the load current flowing through the heater of the thermal relay.
This invention relates to a current limiter for a thermal relay constructed by housing a shunt element connected in parallel to the heater in a separate case from the thermal relay, and in particular, the mounting part thereof has been improved.

Conventionally, as shown in FIG. 4, as a mounting part for this type of current limiter, a terminal plate 8C is fixed to the outer surface of a shunt element 8 consisting of an iron core 8a and a saturable reactor coil 8b wound around the iron core 8a. One end of the shunt element 8 is connected to 8C, and a solid conductive plate 9 is attached, and the other end of this conductive plate 9 is fixed to one heater terminal 5b of the thermal relay 5, so that the coil is electrically and mechanically thermally It was attached to a relay.

Note that the other end of the shunt element 8 is connected to the other heater terminal 5C via a lead wire 8d.

However, in the conventional example described above, since the shunt element 8 is left exposed and protrudes from multiple sides of the thermal relay 5,
The shunt element 8 occupies a large space, and it is difficult to connect the load wires (not shown) and the main contact terminals of the magnetic contactor (not shown) to the heater terminals 5b and 5C. However, in order to ensure insulation safety, it must be separated from other equipment such as electromagnetic contactors, which increases installation space.

In consideration of the above points, the present invention eliminates the above-mentioned drawbacks of the conventional relays by allowing the thermal relay and its current limiter to be installed separately or in combination in a compact manner depending on the size and shape of the installation location.

To explain the embodiment, in Fig. 1, reference numeral 1 denotes an insulating case formed in a box shape, the interior of which is partitioned into three chambers by an insulating wall 1a to house three shunt elements 2 consisting of an iron core 2a and a coil 2b. ing.

Two opposing surfaces of the case 1 are provided with three holes 1b each for leading out the lead wires 2C of the shunt element 2 to the outside, and one side of the case 1 is provided with three holes 1b for guiding the lead wires 2C of the shunt element 2 to the outside.
A mounting portion 1C consisting of a mounting leg for mounting in a standing position is provided in a protruding manner, and the mounting leg 1C is further provided with a mounting notch 1d.

In addition, the opening surface to which the lid 4 of the case 1 is attached includes a mounting part 1e consisting of a mounting hole for mounting the case 1 horizontally on the fixing base 3, a mounting hole 1f of the cover 4, and a thermal relay 5 (
Internally threaded mounting holes 1g are respectively provided to match the mounting legs 5a of the thermal relay for connection with a thermal relay (to be described later).

The lid 4 is provided with mounting holes 4a and 4b that correspond to the mounting portion 1e and the mounting hole 1f, respectively.

The current limiter 6 is composed of the above-mentioned parts, and in case 1
After housing the shunt element 2, the lid 4 is covered and screws are tightened into the mounting holes 4b to assemble.

Figure 2 is a perspective view of the current limiter 6 installed side by side with the thermal relay 5, where the current limiter 6 is attached to the mounting part 1C.
The lead wires 2C led out from the case 1 are connected to the heater terminals 5b and 5C of the thermal relay 5.
The shunt element 2 is connected in parallel to a heater (not shown).

Note that 7 is an electromagnetic contactor connected to one side 5C of the heater terminal via a connecting piece 7a.

In this case, the current limiter 6 occupies the mounting area by itself, but since it occupies only one side of the thermal relay 5, the area is smaller than the conventional one, and the terminal 5 of the thermal relay
There is no obstacle around 5C, and the work of connecting the connection piece 7a of the electromagnetic contactor 7 and the load-side electric wire (not shown) to it is much easier than in the conventional case.

This mounting force is suitable for installation locations where the mounting area is relatively large and the height is low.

Figure 3 is a perspective view of the current limiter 6 and thermal relay 5 stacked on top of each other and mounted on the fixed base 3.The current limiter 6 is mounted horizontally on the fixed base 3 using the mounting hole 1d, and the cover is Lay the thermal relay 5 on top of the thermal relay 4 and attach its mounting part 5a to the mounting hole 4b.
Tighten the screws to match.

The lead wire 2C of the shunt element 2 led out from the case 1 is connected to the thermal relay 5 as in the case of FIG.

In this case, the height of the thermal relay 5 increases by the thickness of the current limiter 6, but since the space for the thermal relay 5 on the fixed base 3 is not required, the combined installation area of both can be smaller than before. Since the current limiter 6 is located below the thermal relay and there are no obstacles around the heater terminals 5b and 5c, the work of connecting the connection piece 7a and the load-side electric wire becomes easier.

This mounting force is suitable for installation locations where the mounting area is relatively small and the height is high.

Note that since the current limiter 6 has the shunt element 2 housed in the case 1, there is no problem with insulation even if the current limiter 6 is brought close to other equipment.

As is clear from the above explanation, according to the present invention, current limiters for thermal relays can be combined with thermal relays depending on the installation location, and current limiters can be brought closer to other adjacent devices, thereby replacing current limiters with conventional ones. It can be installed more compactly, and other conductors can be easily attached to the thermal relay.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the embodiment of the present invention, Figure 2 is a perspective view of the current limiter installed vertically, and Figure 3 is the current limiter installed horizontally with thermal relays stacked on top of each other. FIG. 4 is a perspective view showing an attached state of a conventional example. 1: Case, 1b: Outlet hole, 1c, 1e: Mounting part, 2:
Shunt element, 2C: Lead wire, 3: Fixed base, Ig, 4b:
Mounting hole, 5: Thermal relay, 5a: Mounting leg, 5b, 5
C: Heater terminal.

Claims (1)

[Scope of utility model registration request] In a current limiter for a thermal relay configured by incorporating a shunt element connected in parallel to the heater terminal of the thermal relay in a case separate from the thermal relay, an outlet hole for the lead wire of the shunt element is provided outside the case. At the same time, mounting portions are provided on multiple sides of the case for selectively attaching the multiple sides of the case to the fixed base, and a mounting hole for integrally connecting the thermal relay to one side of the case is provided for mounting the thermal relay. A current limiter for a thermal relay characterized by being provided to match the legs.