Gruner damper actuators, smoke extraction drives and relays

Gruner mechatronic equipment: HVAC damper actuators up to 60 Nm, fire protection actuators 340/360, VAV actuators 327, and latching relays.

Gruner HVAC damper actuators for ventilation and air handling units

Gruner non-spring return actuators deliver operating torques up to 60 Nm to control air dampers with surface areas up to 10 square metres. These drives feature minimal power consumption in motion and standby, quiet operation, and a design life exceeding 100,000 full stroke cycles.

Output torque range from 5 to 60 Nm suited for ventilation dampers and louvers
Universal power supply ratings for 24 V and 230 V alternating or direct current
Two-position, three-point floating, or modulating proportional 0-10 V control
Integrated electronic overload protection and configurable auxiliary switches

Gruner fire protection and smoke extraction actuators series 340 and 360

Spring return actuators series 340 and 360 are engineered for fire dampers and smoke control assemblies. Heat-resistant steel gear trains withstand temperatures exceeding 120 °C, and mechanical springs deliver fail-safe shutoff within 20 seconds upon power loss.

Reliable spring return mechanism providing continuous torque across 95 degrees
Steel gear train components with integrated 72 °C thermal duct sensor probe
Dedicated actuator variants 342 and 362 tailored for smoke extraction dampers
Digital network integration via native Modbus RTU and BACnet MS/TP protocols

Gruner series 327 VAV volume flow control compact actuators

Gruner 327 VAV actuators combine a precision servomotor, integrated differential pressure sensor, and digital controller within a single housing. The unit provides linear volumetric airflow regulation for supply and exhaust air systems in modern energy-efficient architecture.

Integrated dynamic differential pressure sensor spanning from 0 up to 500 Pa
Factory calibration for static and dynamic air volume flow characteristics
Direct shaft mounting via universal self-centering clamp mechanism on dampers
Rapid field setting of minimum and maximum volume limits via service terminal

Gruner series 224 rotary actuators for control ball valves

Gruner 224 rotary actuators provide automated positioning for regulating and shut-off ball valves up to DN40. These drives withstand fluid dynamic transients, operate reliably with fluid temperatures from -30 °C to +141 °C, and suit water, steam, and industrial glycol mixtures.

Compact mounting directly to valve brackets per ISO 5211 without adapter kits
Manual override capability via integrated mechanical lever on the top housing
Enclosure ingress protection IP 54 suitable for humid equipment utility rooms
Visual mechanical position pointer and electrical status feedback indicators

Gruner polarized latching relays series 716, 726 and 743

Gruner 716, 726, and 743 polarized bistable relays are built for smart metering, automatic transfer switching, and smart load management. Utilizing energy only during transient switching pulses, these units switch continuous currents up to 200 A without coil heating.

Switching capacity up to 200 A with high short-circuit withstand capability
Zero electrical power consumption during steady closed and open contact states
Rotary polarized armature delivering high shock tolerance and vibration strength
Integrated auxiliary microswitch providing hardware contact status validation

Gruner automotive and high-voltage power contactors 760, 802 and 860

Gruner 760, 802, 852, and 860 series power contactors are engineered for electric vehicle battery systems up to 800 V and AC charging stations up to 22 kW. These contactors provide galvanic battery disconnection, peak surge withstand up to 16,000 A, and 120 g shock resistance.

Traction high-voltage insulation up to 800 VDC for vehicle traction batteries
Surge current withstand capacity up to 16 kA with shock resilience rating of 120 g
Four-pole isolating relays type 802 compliant with charging standard IEC 62955
Integrated NTC temperature sensing and hardware circuit monitoring feedback

Gruner industrial engineering legacy and German production plant in Wehingen

The engineering heritage of German manufacturer Gruner originates in 1953 in Wehingen, Baden-Wurttemberg. Founded by Wolfgang Gruner, the company developed from a precision engineering workshop into an internationally recognized leader in specialized actuators and bistable relays.

German engineering discipline formed uncompromising standards for component endurance.

The corporate headquarters and primary development center are located in Wehingen, while international production includes advanced facilities in Serbia, Tunisia, and India.

Complete vertical integration encompasses stamping, magnetic core annealing, precision plastic injection molding, automated coil winding, and assembly lines with 100 percent quality testing.

Kinematics and electrical efficiency of non-spring return damper actuators

Gruner non-spring return actuators with torque ratings up to 60 Nm operate heavy ventilation louvers and dampers with surface areas up to 10 square metres.

Patented low-friction gear trains ensure smooth and silent damper rotation without mechanical backlash, preserving air duct seal integrity across demanding commercial infrastructure.

An electronic control board monitors shaft position and reduces motor coil current upon stroke completion. Zero power consumption in holding state reduces overall electrical panel load throughout building automation systems.

A universal self-centering shaft clamp guarantees secure installation on round and square ventilation damper drive spindles.

Thermal-resistant smoke extraction and spring return fire damper actuators

In building safety networks, Gruner actuators in series 340, 360, 342, and 362 perform the critical duty of isolating fire zones and supporting smoke evacuation.

The mechanical structure functions under elevated temperatures exceeding 120 °C, and heat-treated steel gear wheels prevent jamming during structural thermal expansion of the damper housing.

Upon electrical interruption or thermal sensor activation, a wound mechanical steel spring drives the fire damper to its secure closed position in under 20 seconds.

Integrated BLDC brushless motors guarantee spring and kinematic durability exceeding 60,000 cycles, and native Modbus RTU communication transmits real-time status to facility management.

Precision volume airflow regulation in compact 327 VAV installations

Delivering indoor environmental comfort requires accurate volumetric airflow regulation.

Gruner 327 VAV series compact actuators combine a high-speed actuator, a precision diaphragm differential pressure sensor, and a programmable airflow controller into an integrated assembly for modern building ventilation zones.

The drive continuously evaluates volumetric flow from differential pressure readings across the orifice ring and smoothly adjusts damper angle, sustaining steady air delivery regardless of duct static pressure variations.

Setting minimum and maximum volumetric flow parameters Vmin and Vmax is completed quickly via the integrated diagnostic port.

Polarized latching relays for smart metering and automatic transfer systems

Gruner is a world developer of polarized latching relays in series 716, 726, and 743 designed for modern electronic electricity meters and automatic load disconnect switches.

Unlike conventional electromagnetic relays, a permanent magnet bistable armature maintains contact closure without continuous current flow through the actuation coil.

Pulsed switching eliminates internal thermal dissipation within the meter enclosure and prevents accidental circuit opening under vibration or mechanical impact.

Heavy-duty silver alloy contact tips and arc quenching chambers handle electrical currents up to 200 A and withstand short-circuit conditions without contact welding.

High-power contactors for electric vehicle platforms and AC charging units

Electric mobility demands dependable galvanic isolation for traction battery circuits.

Gruner high-voltage contactor series 760, 852, 860, and 870 accommodate battery pack potentials up to 800 V and continuous current loads up to 250 A, providing rapid separation of the traction power source during electrical faults or vehicle overloads.

The 802 series contactors are designed for bidirectional AC charging stations up to 22 kW conforming to IEC 62955 standards.

A four-pole mechanically linked contact assembly guarantees simultaneous isolation of all phases and neutral conductors, while integrated NTC thermistors relay real-time terminal temperature data to the charging controller.

GRUNER and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of GRUNER and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.