Metron Actuator Technical Specifications

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The Chemring Metron DR2000 Series

The Chemring Energetics UK Ltd DR2000 series of Metrons
has been used on a global scale since the early 1970’s.

The range has been developed over the years to meet demanding customer requirements and today Metron Actuators are a key component in many safety critical systems.

All of our actuators are hermetically sealed and have been comprehensively tested in harsh mechanical and climatic environments.

Metron Actuators are available in a variety of stroke lengths and different levels of energy output.

There are also options on the electrical firing characteristics
ranging from low threshold (0.145Amps All Fire) through
to the EMC safe 1A1W-5minute No Fire standard (5 Amp All Fire).

Metrons can also be supplied with a range of cable finishes from simple flying leads to over-moulded ends with flame resistant sheathing.

 A special form of the Metron has been developed specifically for gas bottle penetrating applications. This has a unique profile in the piston which allows the bottle to be opened and gas to subsequently flow through the aperture.

The following page provides the key characteristics of the Metron Actuators and associated cable finishes with stroke sizes ranging from 3.5mm to 20mm. Special forms of the Metron are also included.

Please contact us if the combination you are looking for is not listed and we will check to see if we can meet your requirements.

Actuators for Security Technology

Technical Specifications of Metron Actuators

Metron Actuator diagram
Metron Actuator Technical Specifications

Cable Finishes

for each of the Metron device certain cable finishes are available

C1 Hexagonal end cap


Hexagonal end cap. (Fly leads approx 95mm long). PTFE sleeves

The cable finish is defined by C(x) where x is a number corresponding
to the type of finish e.g. DR2003/C1 corresponds to a Metron Actuator defined as DR2003 with cable finish C1.

C2 Hexagonal end cap


Hexagonal end cap. Multistrand leads. 1000mm long (red).
C3 Hexagonal end cap


Hexagonal end cap. Plastic overmould. Multistrand leads. 1000mm long (red).


The electrical characteristics are defined
by the DR number within each series
e.g. DR2003 uniquely determines the
physical dimensions and the electrical
characteristics of that actuator.

C63 Plastic Overmould 1/4 Blade


Plastic Overmould 1/4 Blade (0.8mm thick) Terminals.
C67 Plastic Overmould cable


Plastic Overmould with oil and heat resistant sheathing

Installation and safe use of Metron Actuators

Metron Actuator
Figure 1. Protractor As Received
1. Instruction Scope
1.1 This section provides information on the product characteristics, handling, and installation of the Metron Actuators:
1.2 All information is intended for guidance only. Recipients should satisfy themselves with the suitability of the Metron Actuator for their particular purpose.
2. Actuator Characteristics
2.1 Metron Actuators are category P1 pyrotechnic articles.
2.2 These Actuators are available with varying electrical sensitivity and performance characteristics such as force, energy, function time, and piston stroke length.
2.3 Initiation of a Metron Actuator will result in the forceful movement of a piston to perform mechanical work.
Metron Actuator
Piston projected following initiation
2.4 During the process this will result in a small metal septum being ejected from the front of the device, and a piston will project at a high velocity up to a maximum of 20mm in length (Fig 1). The septum will decelerate quickly due to its weight, and will typically travel up to 30 centimetres if unobstructed.
3. Linking and Arrays of Metron Actuator
3.1 Metron Actuators may be linked to form an array for some applications.
3.2 CEUK recommend series firing as being the simplest and most reliable method to fire multiple Metron Actuators simultaneously. It is critical that only Metron Actuators of the same electrical sensitivity are linked in a multiple firing circuit.
3.3 It is recommended that users contact CEUK if planning on using a multiple firing circuit.
4. Installation Guidelines
4.1 Metron Actuators are used in a wide range of applications and, as such, installation procedures are largely governed by customers systems.
4.2 Some actuators are fitted with a hexagonal end cap, and care must be taken to ensure that no movement occurs at the end cap relative to the body. Actuators should be installed tight by hand force, and use of a wrench avoided during installation/ removal. Movement of the end cap relative to the body may render the actuator inoperable.
4.3 Care must be taken to ensure that the actuator cable/lead wires do not twist or flex relative to the actuator during installation. The lead wires are fragile and can be easily damaged due to twisting/flexing. N.B. this does not refer to Metron Actuators which are supplied with twisted cables as part of the cable finish.
4.4 Electrical test meters and monitoring circuits must be limited to 0.01 Amps short circuit current to prevent inadvertent operation of the Metron Actuator. Unless otherwise stated by CEUK, this monitoring current level must not be exceeded.
5. Product Safety, Storage and Disposal
5.1 Users should refer to the Product Safety Data Sheet, PSDS-67, for relevant information on hazards, toxicity, storage, and disposal of Metron Actuators.
5.2 The actuator should be replaced before the end of it’s life and this may depend on it’s service and conditions. Metron Actuators have a maximum total life of 11 years from date of manufacture, consisting of 1 year shelf life, and 10 years’ service life at standard ambient conditions. More arduous environments may require more frequent replacement. The date of manufacture can be found on the article and/or packing label.
6. Additional Information
Additional information on performance and safety can be sought from the relevant Product Specification Data Sheet, Product Safety Data Sheet, and other technical guidance documents.
Chemring Energetics UK Ltd should be contacted if additional information is required.