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Operating Instructions: Interlock Blocking - 

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L

PHA

Description

Unique Safety Products ALPHA 

is an Interlock Blocking 

device designed to provide additional safeguarding to 
prevent operators being trapped inside a safeguarded 
space in machine guarding applications where whole body 
access is required. The 

ALPHA

 works in conjunction with 

existing interlocking to prevent the unexpected reset or 
restart of the safety-related circuit. It works by forcing the 
removal of a personnel or safety key before the guard can 
be fully opened and preventing the guard from fully closing 
until the key is returned. Thus, while the key is with the 
operator inside the area, the interlock is blocked from 
allowing the machine to be reset or restarted. Additional 
padlock points allow for each individual entering the area to 
apply their own means of control to the device.

As a purely mechanical component complete with an 

integrated mounting plate it is easily retrofitted or added to 

an existing system, regardless of interlock type, without the 
need for wiring or programming. 

Options & Ordering Information

Description

Part No.

ALPHA 

suitable for Left hand facing Hinged Doors

ALP

2H-1-1-CLSS-MP1

ALPHA

 suitable for Right hand facing Hinged Doors

A

L

P

4H-1-1-CLSS-MP1

ALPHA

 suitable for Left hand facing Sliding Doors

A

L

P

2S-1-1-CLSS-MP1

ALPHA 

suitable for Right hand facing Sliding Doors

A

L

P

4S-1-1-CLSS-MP1

NOTICE! 

The ALPHA

 is not an interlock and must only be used in addition to an interlock as part of a safety related part of a control 

system that meets required reliability.

The 

ALPHA

 cannot be used in conjunction with an Interlock that includes an Escape Release or Internal facing 

handle.

Important:

The 

ALPHA

 Interlock Blocking Device is designed for use according to the installation and operating instructions enclosed. It 

must be installed by competent and qualified personnel who have read and understood the whole of this document prior to 

commencing installation.

If the Device or guarded machinery equipment is used in a manner not specified by the manufacturer, the protection provided 

by the equipment may be impaired.

Any modification to or deviation from these instructions invalidates all warranties.

Unique Safety Products and 

Fortress Interlocks Ltd accept no liability whatsoever for any situation arising from misuse or 

misapplication of the Device.

 

The 

ALPHA

 alone is not an Interlock and must only be used in addition to an Interlock as 

part of a complete machine guarding system. The paired Interlock device must meet all relevant safety requirements 
and applicable safety standards.

BEWARE OF INTENTIONAL MISUSE CAUSED BY OPERATORS WANTING TO BYPASS SAFETY SYSTEMS. THE 
INSTALLER SHOULD ASSESS THE RISKS AND MITIGATE AGAINST THEM.
The installation and operation of the 

ALPHA

 and the complete machine guarding system must take into account the 

requirements of ISO 14119:2013, in particular Section 7 - Design for minimising defeat possibilities.
In order to maintain device safety rating, overall machine guarding system must be validated to EN ISO 13849-2 and/or 
evaluated in accordance with IEC 62061.

IF YOU HAVE ANY QUESTIONS OR QUERIES OF ANY NATURE WHATSOEVER PLEASE CONTACT THE SUPPLIER 
WHO WILL BE PLEASED TO ADVISE AND ASSIST.

ALPHA

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ALPHA

-S

Unique Safety Products | www.uniquesafetyproducts.com | [email protected] 

Summary of Contents for ALPHA-H

Page 1: ...ALPHA cannot be used in conjunction with an Interlock that includes an Escape Release or Internal facing handle Important The ALPHA Interlock Blocking Device is designed for use according to the inst...

Page 2: ...When extended the Blocker plate prevents the Door or Gate from being re closed and locked before the Personnel Key has been reinserted and rotated Padlocks can be added to the Blocker plate for additi...

Page 3: ...R PLATE ENGAGED AND PREVENTING DOOR FROM CLOSING PADDLE PLATE ENGAGED AND PREVENTING DOOR FROM OPENING FULLY FORTRESS www fortressinterlocks com THE COPYRIGHT OF THIS DRAWING BELONGS TO FORTRESS INTER...

Page 4: ...LE 1 00 SHEET 1 OF 3 ORIGINAL SIZE DATE 18 05 21 ISSUE 0 A INTERLOCK BLOCKING DEVICE FOR SLIDING DOORS DWG NO SD 00030 DOOR CLOSED STATE DOOR OPEN STATE DOOR ENTRANCE THIS SIDE OF DEVICE HOOK PLATE EN...

Page 5: ...m THE COPYRIGHT OF THIS DRAWING BELONGS TO FORTRESS INTERLOCKS Ltd THE CONTENT OF THIS DRAWING IS CONFIDENTIAL AND MUST NOT BE DISCLOSED TO ANY 3rd PARTY WITHOUT SPECIFIC WRITTEN APPROVAL ALL DIMENSIO...

Page 6: ...chine and guarding when closed and locked Safety Outputs High must not exceed the limits specified in ISO 13857 ISO 14120 All fixing screws used to mount the complete Device must be permanently preven...

Page 7: ...ility Coverage is Voided Under the Following Conditions If these instructions are not followed Non compliance with safety regulations Installation and electrical connection not performed by authorised...

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