Glossary electric strikes

The door is shown from the side on which the door hinges are visible. It is open to this page. The DIN specifications of the strike or strike plate refer to the DIN table.

For double-leaf doors, the DIN direction of the active leaf is decisive.

In order to derive the high voltage that arises when switching off coils, we recommend using strikes with a diode. This prevents any further connected devices from being damaged.

For strikes with recovery diode or bipolar protective diode (suppressor diode), a diode in the blocking direction is used parallel to the coil. This serves as a recovery diode.

Important: Bipolar diodes can be operated with DC and AC. For recovery diodes, the pin assignment must be observed! They are only suitable for direct current!

The equipment with additional monitoring contact (RR) is recommended and even necessary for certain applications.

Application: for door code systems, access control or other control electronics when strikes and electronics are connected to the same power supply. With effeff access control systems, a strike with recovery diode / suppressor diode is generally required.

Strike plates for electric strikes can be fitted with FaFix dummy components. In the case of changes of use, the replacement parts can be exchanged for electric strikes without having to change the strike plate.

With FaFix the keeper is split. The upper case part can be offset and fixed. So a part of the keeper is fixed. The strike remains in its position on the strike plate.

FaFix strikes with the adjustable and fixable keeper allow precise adjustment to the latch position. The door seal pressure can thereby be increased or decreased.

Fafix is standard on modern strikes (e.g., Model 118).

The door is locked if not energized. As long as the strike is energized it can be opened. In AC operation, a buzzer is audible. Not in DC operation.

Not energized is the door unlocked and energized locked. Only to operate with DC voltage.

Application: sluice lock; escape door strike model 331/332 as electrical locking of an escape route.

Adjustable and fixable strikes. An ideal workload for keeper adjustment.

The screw holes in the strike plate are milled oval. Longitudinal grooves on top of the strike and underside of the strike plate.

After installation, the strike housing can be adjusted horizontally by 4 mm behind the striking plate, aligned with the latch and fixed in locking grooves.

For corrective and reliable installation even in difficult installation conditions.

Eventually larger cut-out required for the strike.

The fixed keeper is a keeper without adjustment (without FaFix function).

Electric strikes with fixed keepers generally have a deeper keeper engagement depth than electric strikes with FaFix keepers.

The door is locked without voltage (fail locked). After contact, it is a one-time opening possible: after the contact is made, the latch-controlled locking pin in the centre of the keeper, keeps the strike unlocked, until the door is opened.

Application: e.g. for unlocking two strikes in successive doors.

A keeper slide is generally referred to a sliding surface with a slope at which a latch slides along ("slips") and is pushed back during sliding to the striking plate surface.

Keeper slides, for example, can be attached to the electric strike (ProFix^®), to the striking plate or to separate adapters.

Depending on the door system and design of the door seals, a stronger latch spring may be advantageous when operating with day release (E-lever).

The so-called latch spring is responsible for locking the door when the day release is activated.

Weak latch springs can reduce the opening force on the door and reduce noise.

Preferably to be used for doors with door closer or with swing door operator.

The monitoring contact is a built-in micro-switch in the strike, which is actuated by the latch. The monitoring contact indicates whether the door is open or closed. This is useful for access control and door opening time monitoring.

The noise damping enables the electric strike to operate quietly, especially in door systems with tubular frames or in sensitive environments such as hotels or care. The function of the door opener latch is damped.

Electric unlocking (eE or 100% ED) via continuous power supply

• low power consumption
• only possible with DC voltage

Modes:

• eE DC continuous operation / AC short-term operation
• 100%ED DC continuous operation / AC not possible
• only fail-locked strike

Application

• Free transit traffic, e.g. for goods transport
• Shop opening hours / office hours with time switch

Mechanical release (E) via side release lever (E-lever)

Due to the force applied by the seal on the door leaf, it is expected to be a preload on the keeper.

This preload prevents a safe unlocking and affects the opening function.

Strikes operated with AC can be used with a higher preload.

Standard strikes can work with AC and a max. preload of approx. 80 N or with DC approx. 20 N safely.

If larger forces occur, special strikes, such as Model 131, 143 or 118F, should be used. 

Different preload behaviour with alternating current (AC) and direct current (DC):

If the strike is energized with AC (alternating voltage) (humming noises audible), the magnetic field is opened and closed 50 times a second (50 Hz). This creates a hammering motion at the anchor and, to a certain extent, the strike can unlock with preload.

If DC is applied to the strike (click sound is audible), a magnetic field is generated in the coil. This magnetic field must now overcome the force that is applied to the armature via the change.

If this force is higher than that of the magnetic field, the strike will not unlock or the user must first pull (or press) the door into the seal to reduce the preload.

Pulsed DC voltage (50% residual ripple) is when the AC voltage is fed through a rectifier. In this connection, the negative half wave is simply converted into positive.

Since the pulsating DC voltage on the strike generates a pulsating magnetic field as well, the strike can unlock somewhat better than when operating with stabilized DC voltage.

ProFix^® combines a FaFix^® strike with a latch guide integrated into the strike, enabling retroactive adjustment even with radius keepers.

In addition, ProFix^® improves the overall appearance of the door, as the sealing level between the door leaf and the frame is not interrupted.

Detailed information on our ProFix-page.

Strikes with a standard keeper tend to cause the keeper to pivot out to the side. In order for the latch to be released, the frame must be recessed laterally.

For flush-fitting doors, strike plates with latch guide are required.

With ProFix^®, the cover latch guide is integrated in the radius strike.

FaFix strikes are equipped with screw-on attachments. This makes an adjustment of the door seal pressure possible.

Mechanical release (E) via side release lever (E-lever)

The x-dimension determines the choice between ProFix1^® and ProFix2^®. It indicates the distance between the jamb of the frame and latch or keeper.

Flush- fitting doors

x-dimension larger than/equal to 9.4 mm           = ProFix 1

Applications with HZF and LAP strike plates can always be replaced by the ProFix system. 

Rebated doors / aluminium and plastic doors

x- dimension from 4 mm  = ProFix 2

x- dimension smaller than 4 mm = ProFix not replaceable

All radius strikes are ProFix compatible: 118, 332 and 143