Type 59A7 & 59B7: Electric fire detection switches with thermal glass bulb or fusible link, wall mounting



Fire detection in buildings. This device operates electrical contacts for remote alarm and simultaneous control of electrical servo-controls such as electric cylinders, electric motors or solenoids, for opening or closing air conditioning dampers, doors, sunroofs, and openings in exterior building walls.


Main Features

Thermal sensitive part: Thermo-breakable bulb or eutectic alloy link.

Operation: The break of the bulb or the melting of the fusible link activates, by means of a ceramic pusher, an electric switch.

Mounting: Enclosure with 4 removable legs, allowing mounting on the wall or ceiling. If the mounting is done on a particular board, removing the 4 legs on the back provides access to 4 M4 threads available for this purpose.

Orientation: The temperature-sensitive part (glass bulb or fusible link) is mounted on a stainless-steel support that can be rotated every 90° to position it in the most favourable direction to the air flow.

Electrical contact: Double snap action contact with two independent circuits, one normally open and the other normally closed. Total contacts spacing is larger than 3mm, providing full disconnection upon IEC standards.

Electrical rating: 16A (4A) 250VAC; 10A (1A) 400VAC; 4A (100mA) 24 and 48VDC. Compatible with electric door magnets in 24V and 48V, 500 N.

(Version with gold plated contacts for low level electronic circuits available on request).

Enclosure: 70 x 80 x 45mm in UV resistant black PA66, with captive lid screws in stainless steel.

– Flammability: UL94V0 and GWFI 960°C.

– Deformation temperature under load: 225°C. (ISO 75-2, 1.8 MPa).

– Ambient temperature class T150°C.

– Resistance to corrosion better than 1000 hours in salt spray fog at 5%.

– Ingress resistance: The highest class, IP69K (washable at high pressure hot water cleaner).

– Impact resistance: The highest class, IK10 (except stainless steel support for temperature-sensitive parts and glass bulbs).

Electrical connection: On screw terminal block, 7 terminals 2.5mm². Shipped with a 3-way shunt and a 2-way shunt, allowing different contact and connection arrangement solutions. Cable outlet by two M16 cable glands.


– Replacement of the temperature-sensitive part can be made without tools

– A test button (option) accessible from the outside allows to check instantly the operation of the switch without any disassembly or opening.

– The enclosure has holes for the installation of seals preventing unauthorized opening.

– Temperature sensitive parts may also be sealed to prevent unauthorized replacement.

Visualization: Optional 230 V, 24V or 48V pilot light. This pilot light can be used to visualize the presence of voltage on the line, a critical parameter for “contact closes on fire” detection systems.

Rod type sensor: This device, in the thermal bulb version, is also available with a rod-type sensor for wall-mounted air duct use (see type 59A8).

Other options: Customization and customer labelling. Output by a single cable gland.




2D&3D Drawing

 Main references

Thermal glass bulb types (Type 59A)

Operating temperature Reference without test button, without pilot light Reference without test button, with 230V pilot light* Reference with test button, without pilot light Reference with test button and 230V pilot light**
Without thermal bulb 59A70PS1630003C 59A71PS1630003C 59A7AP2S1630003C 59A7BP2S1630003C
57°C (135°F) orange color bulb 59A70PS1630573C 59A71PS1630573C 59A7AP2S1630573C 59A7BP2S1630573C
68°C (155°F) red color bulb 59A70PS1630683C 59A71PS1630683C 59A7AP2S16300683C 59A7BP2S1630683C
79°C (174°F) yellow color bulb 59A70PS1630793C 59A71PS1630793C 59A7AP2S1630793C 59A7BP2S1630793C
93°C (199°F) green color bulb 59A70PS1630933C 59A71PS1630933C 59A7AP2S1630933C 59A7BP2S1630963C
141°C (286°F) blue color bulb 59A70PS1631413C 59A71PS1631413C 59A7AP2S1631413C 59A7BP2S1631413C


Eutectic alloy fusible link device (Type 59B)

Operating temperature Reference without test button, without pilot light Reference without test button, with 230V pilot light* Reference with test button, without pilot light Reference with test button and 230V pilot light**
Without fusible link 59B70PS1630003C 59B71PS1630003C 59B7AP2S1630003C 59B7BP2S1630003C
70°C (158°F), non Rohs alloy 59B70PS1630703C 59B71PS1630703C 59B7AP2S1630703C 59B7BP2S1630703C
72°C (162°F), Rohs alloy 59B70PS1630723C 59B71PS1630723C 59B7AP2S1630723C 59B7BP2S1630723C
92°C (198°F), non Rohs alloy 59B70PS1630923C 59B71PS1630923C 59B7AP2S1630923C 59B7BP2S1630923C
96°C (205°F), non Rohs alloy 59B70PS1630963C 59B71PS1630963C 59B7AP2S1630963C 59B7BP2S1630963C
138°C (280°F), Rohs Alloy 59B70PS1631383C 59B71PS1631383C 59B7AP2S1631383C 59B7BP2S1631383C

* -For models without test button with 24V pilot light, replace 1P by 2P in the reference

-For models without test button with 48V pilot light, replace 1P by 3P in the reference

** -For models with test button with 24V pilot light, replace BP by CP in the reference

-For models with test button with 48V pilot light, replace BP by DP in the reference