IP Library › Granted Patent US 12,437,906
Granted Patent B2
US 12,437,906 · App. 18/487,155 · Granted Oct 7, 2025

Surge protective devices

Inventors: Georgios Peppas (Kalloni Troizinias, GR); Alexis Chorozoglou (Drama, GR); Elias Fermelis (Koropi, GR); Zafiris G. Politis (St. Stefanos, GR)
Assignee: RAYCAP, S.A.
H01C7/12H01C1/02H05K1/0213H05K1/0218H05K1/18H05K2201/10022
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Quick Facts
Patent No.
US 12,437,906
App. No.
18/487,155
Granted
Oct 7, 2025
Kind
B2
Abstract

A surge protective device (SPD) module includes a printed circuit board (PCB), a first electrode, a second electrode, and a varistor electrically connected between the first and second electrodes. The SPD module forms a housing assembly defining a chamber containing the varistor. The PCB forms a portion of the housing assembly.

Claims (86)

1. A surge protective device (SPD) module comprising:

a printed circuit board (PCB);

a first electrode comprised of a housing electrode defining a cavity and a housing electrode opening communicating with the cavity;

a second electrode; and

a varistor electrically connected between the first and second electrodes and contained in the cavity;

wherein:

the SPD module forms a housing assembly defining a chamber containing the varistor; and

the PCB forms a portion of the housing assembly and closes the housing electrode opening to enclose the chamber.

2. The SPD module of claim 1 wherein:

the second electrode is a piston electrode extending into the cavity; and

the varistor is disposed in the cavity between the housing electrode and the piston electrode.

3. The SPD module of claim 2 wherein:

the PCB includes a hole defined therein; and

an integral terminal post of the piston electrode extends through the hole.

4. The SPD module of claim 1 wherein:

the SPD module includes a varistor stack including a stack of varistor members;

the varistor stack is electrically connected between the second electrode and the housing electrode;

the varistor stack includes at least one electrically conductive interconnect member connecting at least two of the varistor members in electrical parallel between the second electrode and the housing electrode;

the SPD module includes a spacer formed of an electrically insulating material;

the spacer includes a receiver recess; and

a portion of the interconnect member extends outwardly beyond the plurality of varistor members and is disposed in the receiver recess.

5. The SPD module of claim 1 including:

an integral fail-safe mechanism including an electrically conductive, meltable member;

wherein the meltable member is responsive to heat in the SPD module to melt and form a short circuit current flow path through the meltable member, between the second electrode and the housing electrode and bypassing the varistor.

6. The SPD module of claim 1 wherein the housing electrode is electrically connected to an electrically conductive trace of the PCB.

7. The SPD module of claim 6 , wherein:

the SPD module includes an electrically conductive fastener securing the PCB to the housing electrode; and

the housing electrode is electrically connected to the electrically conductive trace of the PCB through the electrically conductive fastener.

8. The SPD module of claim 6 wherein the electrically conductive trace is a ground plane of the PCB.

9. The SPD module of claim 6 wherein the second electrode is electrically connected to a second electrically conductive trace of the PCB.

10. The SPD module of claim 9 wherein the PCB includes:

an integral first terminal electrically connected to the first electrically conductive trace; and

an integral second terminal electrically connected to the second electrically conductive trace.

11. The SPD module of claim 1 including an elastomeric gasket member that is maintained in an elastically compressed state by the PCB to seal the chamber.

12. The SPD module of claim 1 wherein:

the PCB includes a first PCB section and a second PCB section;

the SPD module further includes:

a third electrode; and

a second varistor electrically connected between the third electrode and the first electrode;

the SPD module forms a second chamber containing the second varistor;

the SPD module includes:

an integral first SPD subassembly including the first and second electrodes, the first varistor, and the first PCB section; and

an integral second SPD subassembly including the first and third electrodes, the second varistor, and the second PCB section.

13. The SPD module of claim 1 wherein:

the SPD module includes:

a second PCB;

a third electrode; and

a second varistor electrically connected between the third electrode and the first electrode;

the SPD module forms a second chamber containing the second varistor;

the SPD module includes:

an integral first SPD subassembly including the first and second electrodes, the first varistor, and the first PCB; and

an integral second SPD subassembly including the first and third electrodes, the second varistor, and the second PCB.

14. The SPD module of claim 1 wherein:

the PCB includes a first PCB section and a second PCB section;

the SPD module further includes:

a third electrode;

a fourth electrode; and

a second varistor electrically connected between the third and fourth electrodes;

the SPD module forms a second housing assembly defining a second chamber containing the second varistor;

the first PCB section forms a portion of the first housing assembly; and

the second PCB section forms a portion of the second housing assembly.

15. The SPD module of claim 1 wherein the PCB is secured to the first electrode such that the second electrode is clamped between the PCB and the first electrode and is loaded against the varistor.

16. A printed circuit board assembly comprising:

a printed circuit board (PCB);

a surge protective device (SPD) subassembly mounted on the PCB, the SPD subassembly including:

a first electrode comprised of a housing electrode defining a cavity and a housing electrode opening communicating with the cavity;

a second electrode; and

a varistor electrically connected between the first and second electrodes and contained in the cavity;

wherein the first electrode and the PCB each form parts of a housing assembly defining a chamber containing the varistor and the PCB closes the housing electrode opening to enclose the chamber.

17. The printed circuit board assembly of claim 16 wherein the PCB is secured to the first electrode such that the second electrode is clamped between the PCB and the first electrode and is loaded against the varistor.

18. A power supply circuit comprising:

a surge protective device (SPD) module comprising:

a printed circuit board (PCB);

a first electrode comprised of a housing electrode defining a cavity and a housing electrode opening communicating with the cavity;

a second electrode; and

a varistor electrically connected between the first and second electrodes and contained in the cavity;

wherein:

the SPD module forms a housing assembly defining a chamber containing the varistor; and

the PCB forms a portion of the housing assembly and closes the housing electrode opening to enclose the chamber;

a first electrical line at a first electrical potential connected to the first electrode; and

a second electrical line at a second electrical potential connected to the second electrode.

19. The power supply circuit of claim 18 including:

a remote monitoring device;

a first remote monitor line connected to the first electrode through the PCB; and

a second remote monitor line connected to the second electrode through the PCB.

20. The power supply circuit of claim 18 wherein the PCB is secured to the first electrode such that the second electrode is clamped between the PCB and the first electrode and is loaded against the varistor.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 16, 2023
From: PEPPAS, GEORGIOS; CHOROZOGLOU, ALEXIS; FERMELIS, ELIAS; POLITIS, ZAFIRIS G.
To: RAYCAP, S.A.
Reel/Frame 065224/0019 →
Continuity (2)
Provisional Application 63380048 · Oct 18, 2022
Related Publication 20240127991A1 · Apr 18, 2024
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