Description
Schischek ExMax-15-BF1 | 15 Nm | Spring return ~1s/90° | ATEX Zone 1, 2, 21, 22
The Schischek ExMax-15-BF1 is a powerful explosion-proof actuator with spring return designed specifically for use in ATEX environments (Zone 1, 2, 21 and 22). Thanks to the high torque of 15 Nm and the extremely fast spring return of approximately 1 second per 90°, this drive is ideal for applications where an immediate return to a safe position is crucial, for example in fire protection or emergency shutdown.
In addition, the integrated Ex-i trip circuit provides intrinsically safe signal transmission, ensuring maximum safety even in hazardous environments.
Key features
- Explosion-proof drive for use in ATEX Zone 1, 2, 21 and 22.
- High reliability thanks to spring return on voltage failure (~1s/90°).
- Torque of 15 Nm for robust valve and slide applications.
- Ex-i trip switching for intrinsically safe signal transmission.
- Suitable for open-close control (3-point).
- Fully enclosed housing with high corrosion resistance.
- Low maintenance design, long service life.
- Optionally expandable with Ex auxiliary switches or Ex terminal box.
Technical specifications
| Type | ExMax-15-BF1 |
| Engine Torque | 15 Nm |
| Spring torque | min. 15 Nm |
| Spring return | ~ 1 s / 90° |
| Operating angle | 90° (max. 95° mechanically adjustable) |
| Supply voltage | 230 VAC, 50/60 Hz |
| Control | Open-close, 3-point |
| Housing | Aluminum, powder-coated, corrosion-resistant |
| Degree of protection | IP66 |
| Explosion-proof | ATEX certified, Zone 1, 2, 21, 22 |
| Additional function | Ex-i trip switching (intrinsically safe) |
| Operating temperature | -40°C … +60°C |
| Weight | approx. 9.5 kg |
Frequently Asked Questions
What makes the ExMax-15-BF1’s spring return unique?
The actuator has an exceptionally fast spring return of about 1 second per 90°, allowing the valve to enter the safe position almost immediately in the event of a power failure.
What is an Ex-i trip circuit?
This is an intrinsically safe limit switch designed so that the electrical energy in the circuit can never become high enough to cause ignition, even in the event of a fault.
Where is this drive primarily used?
It is widely used in industrial plants, chemical plants and offshore environments where explosion safety and fast emergency shutdown are of great importance.
Can I connect additional accessories?
Yes, the ExMax-15-BF1 can be expanded with accessories such as the ExSwitch auxiliary switches or an ExBox junction box.
Drives available in this series:
ExMax-S | without spring return | 5…30 Nm | suitable for use in Zone 1, 2, 21, 22
| Type | Torque | Spring return | Control |  Datasheet | Additional information | Certificate | Declaration of Conformity |
| ExMax-5.10 | 5/10 Nm | – | Open-close, 3-point |  | | | |
| ExMax-15.30 | 15/30 Nm | – | Open-close, 3-point | | | | |
| ExMax-5.10-S | 5/10 Nm | – | Open-close, 3-point | | | | |
| ExMax-15.30-S | 15/30 Nm | – | Open-close, 3-point | | | | |
| ExMax-5.10-Y | 5/10 Nm | – | 0-10VDC, 4-20 mA | | | | |
| ExMax-15.30-Y | 15/30 Nm | – | 0-10VDC, 4-20 mA | | | | |
| ExMax-5.10-R | 5/10 Nm | – | Open-close, 3-point | | | | |
| ExMax-15.30-R | 15/30 Nm | – | Open-close, 3-point | | | | |
| ExMax-5.10-CY | 5/10 Nm | – | 4-20 mA | | | | |
| ExMax-15.30-CY | 15/30 Nm | – | 4-20 mA | | | | |
ExMax-S | with spring return | 5…15 Nm | suitable for use in Zone 1, 2, 21, 22
| Type | Torque | Spring return | Control | Data sheet | Additional info | Certificate | Declaration of Conformity |
| ExMax-5.10-F | 5/10 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-15-F | 15 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-5.10-SF | 5/10 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-15-SF | 15 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-5.10-YF | 5/10 Nm | 3/10 sec / 90° | 0-10VDC, 4-20 mA | | | | |
| ExMax-15-YF | 15 Nm | 3/10 sec / 90° | 0-10VDC, 4-20 mA | | | | |
| ExMax-5.10-BF | 5/10 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-15-BF | 15 Nm | 3/10 sec / 90° | Open-close, 3-point | | | | |
| ExMax-8-F1 | 8 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-15-F1 | 15 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-8-SF1 | 8 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-15-SF1 | 15 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-8-BF1 | 8 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-15-BF1 | 15 Nm | ~ 1 sec / 90° | Open-close | | | | |
| ExMax-5.10-CYF | 5/10 Nm | 10 sec / 90° | 4-20 mA | | | | |
| ExMax-15-CYF | 15 Nm | 10 sec / 90° | 4-20 mA | | | | |
ExMax-S Accessories
| Type | Description | Data sheet | Additional info | Declaration of Conformity |
|---|---|---|---|---|
| ExSwitch | 2 external Ex auxiliary switches | | | |
| ExBox | Ex-e Terminal box | | | |
| ExBox-..-VA | Stainless steel housing | – | – | |
| ExPro-TT-.. | Safety temperature trigger for ExMax -…- BF actuators | | | |
| HV-.. | Manual operation | | – | – |
Do you have any questions or would you like more information? Please contact us! You can reach us by phone, email, or, if you prefer, via the chat function.
Scope of delivery – ExMax (size S or M)
1 × drive with 1 m cable
1 × Allen wrench for manual lifting
4 × screws for mounting
Special models – ExMax -…- BF (size S or M)
Actuators for fire dampers (ExMax -…- BF) + safety temperature switch
ExPro-TT- …
Special models in stainless steel – ExMax -…- VAS / VAM (size S or M)
Corrosion-resistant housing material in stainless steel similar to AISI 316, some parts nickel-plated, screws in stainless steel
Use under extreme weather or harsh climatic conditions
Special models painted (coated) – ExMax -…- CTS / CTM (size S or M)
Aluminum housing with seawater-resistant offshore / marine coating, resistant to corrosive and marine atmosphere, some parts nickel-plated, screws in stainless steel
Suitable for offshore or onshore applications
Accessories / options – ExMax (size S or M)
- External customizable, on-site adjustable switches
- Mounting clamp for round valve pass (only for ExMax size S)
- Ex-e junction box
- Adjustments for butterfly or ball valves
- Mounting bracket
- Cable glands in nickel-plated brass
- Protective cover in stainless steel for mounting on ExMax actuators
- ExPolar heating system for use with ExMax drives under low temperatures down to -50°C