Stedenbaan 6, 5121 DP Rijen
The Netherlands


Our accessories can provide customized solutions for all your interlocks needs.

Interlocks accessories

To offer you the best customized solution we have different accessories like key cabinets, Sequence control unit etc. to ensure safe operation and avoid human failure. Together with our engineers we will select the right accessories for your applications.

Key cabinets

The key cabinet comes in varying sizes and materials. Our key cabinets have the option to use hanging key positions or designated key positions and with an optional see-through door. The key cabinet is mainly housed in the Central Control Room, but can be mounted in the field as well.

The cabinet is designed to house any required number of keys with option of spare positions for future expansion. The material of composition can range from sheet steel, GRP or stainless steel in either 304 or 316 and can be produced with a glazed door to monitor the system status.

The cabinet can be customized with fixings to hang keys in undefined positions or have our Lock Portion require the keys to be inserted in a specific position where we can also configure the assigned key position to hold any key from a specific interlock set whilst preventing insertion by any other keys.

The key cabinet is also an ideal place to store supportive documentation like Interlock System Operating Procedures. Upon requests our key cabinet can be spaced to hold a laser engraved plate with sequence or have multiple laminated sequences kept in a file type retainer.


Alcatraz Interlocks can provide you with spare keys. The spare keys are intended to briefly replace a lost key until a replacement has been purchased. Alcatraz is renowned for its fast service in supplying replacement keys, which when the need is high can even be shipped in a one day timeframe. Further use for the spare keys is when equipment is put into shutdown and the spare keys can be used to operate multiple Interlocks at the same time for maintenance purposes. Spare keys have their own lockable key cabinet strictly controlled by permits and the maintenance manager. By default the spare keys have distinct colour coding so they are not confused with the operating keys.

Commissioning keys

Commissioning keys are keys which allow Interlocks to be freely operated to allow them to be commissioned (or their host equipment). Once these activities are completed the commissioning keys are discarded and disposed of.

Electrical key cabinets

An Electrical Key Cabinet consists of integrated electromechanical components preventing key removal or registering such actions and can also include indicating lights and key release request buttons. Our electromechanical Key Cabinet applications can also be constructed to any ATEX requirements to have these in any possible location on site. Further a pre-programmed selection of electromechanical sequence involving insertion and removal of keys combined with any on site pre requisitions allowing key removal can be implemented into a key cabinet making it a centrepiece of any Interlock System.

Master key

A master key is a key that fits every Interlock irrespective of the key code it has, therefore a master key is excellent to use when an emergency operation is needed. Just like the operating keys they become trapped items, thus a master key can only operate one item at a time. Bespoke group master keys can be produced to only be able to use for a specific group of Interlocks and to be only compatible with the keys from that particular group.

Sequence control unit

The sequence control unit comes in various sizes depending on the number of steps in the operating process. The Sequence Control Unit (SCU) is a mechanical device that is designed to fulfil client's complex non-linear Interlocking Sequence (Interlock Operating Procedure) requirements.

It is generally used for, but not limited to applications like pipeline pigging operations. The Sequence Control Unit has a central rotating shaft with a certain required number of rotational positions where each position requires one or more key movements, be it removing or inserting keys.

In line with the approved Sequence each Sequence Control Unit begins with the initiating step and the indicator on top of the unit guides the operator regarding which keys are to move. Once a key has been inserted the unit can be operated which rotates the central shaft to the next position, following which the key to complete the next part of the sequence can be retrieved.

Once all required steps on the unit have been completed with the last step being removal of the initiating key the unit is brought to its starting position to await the next time the equipment will be used.