M308NONC

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Solar Guardian

"Solar Guardian" by Bremas is a solution specifically designed for use in photovoltaic systems, in order to facilitate fire-fighting support interventions, or ordinary technical assistance, through the automated and/or manual remote disconnection of the DC lines present in the building.

The Solar Guardian is based on three fundamental principles to maintain maximum safety of the system without sacrificing its efficiency:

Rearm: Automatic reactivation of the system once the necessary safety conditions have been re-established (no manual intervention is necessary, the system resumes its normal operation autonomously)

Fire: Emergency disconnection in the event of fire or overheating

Safety: Reliable protection for your photovoltaic system

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Wired string boxes

DC String boxes are made using specific components for the protection and wiring of a single string, two strings in parallel or two independent strings. Furthermore, it is possible to request customized configurations with wiring adapted to the type of PV system.

Pre-wired string boxes with nominal voltage of 600 Vdc and 1000 Vdc are available, with overvoltage protection via type 2 Surge Protective Devices (SPD), overcurrent protection via fuse holders base (fuses included), and isolation via disconnect switches specific for DC-PV1 and DC-PV2 use categories (according to IEC EN 60947-3).

Installation both indoors and outdoors, thanks to enclosures made of insulating material with IP65 protection degree.
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DC Disconnect switches

Bremas disconnect switches range is designed for safety operations even under load.
DP-DK-DM-DX disconnect switches series has been specifically designed for DC applications in the solar industry.
In just one size current ratings from 12A to 60A up to 1000VDC and from 10A to 30A at 1500VDC are available. Thanks to its mechanical and electrical characteristics the DP-DK-DM-DX achieves top performances and the highest standards of quality and operational reliability.

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DC isolator switches

Introducing our Bremas Enclosed DC Isolator Switches, designed and manufactured in Italy for maximum efficiency and durability. These top-tier isolators, compliant with IEC EN 60947 standards, offer:

Current Ratings: From 12 A up to 60 A

Voltage Ratings: Up to 1500 Vdc

Switching Capacity: Up to 4 DC poles

Enclosure: ABS thermoplastic with IP65 protection

Features:

Double insulation

UV-resistant materials

Lockable handle in the “OFF” position for added safety

Compact, ergonomic design

High terminal accessibility

Cover interlock with knob in "ON" position

These DC isolator switches are ideal for photovoltaic systems, ensuring reliability in harsh conditions with durable materials and advanced safety features.

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SPD - Surge protective devices

Our range of surge protection devices (SPDs) offers comprehensive solutions for both DC photovoltaic systems and low-voltage AC distribution networks. The DC models are optimized for photovoltaic applications up to 1000 Vdc, certified according to EN 50539-11, and available in Type 2 and Type 1+2 configurations. The AC models provide effective protection against atmospheric surges in TN-S and TT systems.

Both series integrate high-performance MOV varistors, with the AC versions also including gas discharge tubes (GDT) for enhanced surge dissipation. The modular design simplifies maintenance, while the OCFM integrated disconnection system ensures safe operation at end-of-life. Local status indicators and optional remote signaling, combined with fast DIN rail mounting and IP20-protected terminals, make these SPDs ideal for safe and efficient installations in controlled indoor environments.
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DC Fuse Holders and Fuse link

Designed to ensure protection and reliability in direct current applications, our IEC/EN-certified fuse holders are ideal for photovoltaic installations up to 1000 Vdc. Compact, safe, and easy to mount on DIN rail, they allow for quick fuse replacement, feature IP20 protection, and include a visual indicator for fuse status. Perfect for combiner boxes and inverter protection in controlled indoor environments.
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RCBOs - Residual Current Circuit Breakers with Overcurrent Protection

Compact devices offering combined protection against overcurrents, short circuits, and earth leakage, ideal for AC photovoltaic panels. Featuring C-curve tripping and Type A residual current (300 mA), they ensure reliable performance with mixed resistive and inductive loads. Available in 16–32 A versions with 6 kA breaking capacity and a slim 2-module DIN rail design. IEC/EN 61009 compliant and IP20-rated, these RCBOs are perfect for auxiliary panels, SPI protection, and sensitive AC loads.
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CAM Switches

The range of Bremas cam switches boasts 3 highly performing series in line with the highest market standards.
Their characteristics make them the ideal choice for any industrial application.
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Cam switches in box

Bremas offers a complete range of enclosed solutions with cutting-edge construction details and in line with market needs, which guarantee the suitability in multiple applications: Motor control, line sectioning, commutation. All boxes in sizes up to 63A, are made of ABS and offer IP65 degree of protection, while for the sizes of 100A and 200A in sheet metal. Versions with front drive or lateral lever drive are available.
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AC Disconnect switches

The range of Bremas disconnectors includes the DS 20-32-40A, DS 50-63-80-100A, TS and TSC/TSD series with nominal currents from 16A to 2500A.
The contacts are made with silver alloy tablets with double break positive opening, to ensure a high degree of safety and electrical efficiency. The DS 20-100A series of captive screw clamps have an IP20 protection rating and are supplied in the open position to reduce installation time. Additional clamps and accessories available.
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Disconnect switches enclosed

Bremas range of box disconnectors is available with nominal currents from 20A up to 100A and configuration at 3Poli or 4 Poli.
They guarantee an IP65 degree of protection, reaching a rated insulation voltage of up to 800V.
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Power tools swtiches

Bremas power tool switches are suitable for electrical and electromechanical tools. The products are available with lever or trigger switches, in versions ia 2 or 3 poles.
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Limit and Safety switches

Bremas safety position switches are suitable for a wide range of applications.
From light applications to harsh environmental conditions.
Thanks to its solid construction and its long-lasting stability. It is possible to customize the drives and materials of the switch, depending on the specific needs.
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Microswitches

Bremas miniature position switches are extremely compact with a plastic body and metal drives with galvanically separated ZB-shaped contacts.
Upon request available with gold-plated contacts and quick-acting contact elements.
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Relay sockets

The range of Bremas relay supports includes DIN rail sockets, plug-in modules for interference suppression, clamping springs and marking labels.
The modules are widely compatible with the most popular market standards and have the main international certifications.
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Technical specifications

Serie	M3
Rated insulation voltage	250V
Thermal rated current	10A
Contact elements	1NO+1NC QUICK ACTION
Actuator type	BUTTON WITH LEVER LENGTH 54mm
Material	PLASTIC BODY
Use	Industrial Automation
Code	M308NONC

Documentation and downloads

Datasheet IT Datasheet EN 2D drawing 3D drawing Istructions Certifications Catalogue chapter REACH statement ROHS statement