Learn more about Safety switches for machines, why saftey is necessary, the danger areas and hazards of machinery and the protective measures sensors can offer. For more details: http://www.schneider-electric.com/en/product-subcategory/4930-safety-sensors-and-switches/?filter=business-1-industrial-automation-and-control&parent-category-id=4900

1. Telemecanique Sensors
Briefing
Safety

2. Agenda
Property of Schneider Electric |
Table of content
• Telemecanique Sensors portofolio
• SAFETY sensors XC
• Why safety?
• Protective measures
• Protection of operators
• Sliding guard
• Safety guide
• Where to find further details

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Telemecanique Sensors portfolio
A world-class global brand offering a comprehensive line of products complying
with international standards: IEC, UL, CSA, CCC, GOST
Other
Cordsets, encoders
Safety
RFIDUltrasonicPhotoelectric Pressure
Inductive,
capacitive
NEMA switchesLimit switches

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Quality
Our products have earned the independent approval of all the relevant bodies that
govern the industries and applications we serve.
All our manufacturing facilities are ISO 9001 and ISO 14001 certified.
Limoges, France Batam, Indonesia

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Safety switches for machine gates
• With or without contact
• Coded magnetic switches
based on Reed or Hall effect
technology
Plastic or metal housing, same size,
2 or 3 safety contacts + 2 or 3 auxiliary
contacts, cage-clamp terminals, optional
release push button, connector versions
XCSPA
New
XCSA XCSDM XCSLE/LF

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Why safety?
• Absence of risk does not exist, but it
must be reduced to a tolerable level
• Contribute to risk reduction by means
of preventive measures
• Inherently safe design measures
(Can the hazard be removed?)
• Protective measures realized by
safety-related control systems
• Residual risk is the risk remaining
after preventive measures
have been taken
Risk level
Safety
Residual risk <
tolerable risk
Tolerable
risk
Danger
Risk >
tolerable risk
Residual
risk
Risk w/o
safety barriers
Necessary risk reduction
Actual risk reduction
The machine designer's
main goal is to reduce all
risks to a value lower
than the tolerable risk.

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Danger areas and hazards at machinery
• Determination of machine limits
• Normal use (speeds, loads, substances, etc.,
that might be involved)
• Possible bad use (out of specification)
• Space limits (environment and access)
• Time limits (expected life of the machinery
and periodical maintenance)
• Identify the hazards
• Analysis of the operator and maintenance tasks
on the machine working area
• What aspects of the machine might cause harm?
̶ Mechanical hazards
̶ Electrical hazards
̶ Physical-chemical hazards
The analysis should take
into account all hazards
that can be present
during the life cycle of
the machinery, including
construction, installation,
and disposal.

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Protective measures
• Safety is achieved by safeguarding for those hazards that
can’t be avoided by inherently safe design measures
• Safeguarding should prevent people from coming into contact
with hazards or reduce hazards to a safe state before a
person can come into contact with them
• Control of access to hazardous zones
• Detection of guards and cover opening
• Detection of operator in free access
• Starting, enabling, and stopping dangerous movements
• Generic protective measures — Emergency stop

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Preventa XCS — Protection of operators
For all dangerous machines protected by gate/guard
• By stopping the machine when the key fixed to the machine
guard is withdrawn from the head of the switch
• For heavy-duty industrial machines: metal safety switches
̶ With quick rundown time: XCSA, XCSB, XCSC
̶ With slow rundown time: XCSE
• For light industrial machines: Similar with plastic versions
• By stopping the machine with quick rundown time
• For light industrial and gate imprecise guidance and or subject
to frequent washing
̶ Coded magnetic switches or system: XCSD
• For heavy or light industrial machine
̶ Safety limit switches XCSM, XCSD, XCSP

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Sliding guard on machines
1. Machines without or with low inertia
2. Machines with inertia
Application
example

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Sliding guard on machines
without or with low inertia
Application
example
• Key operated switch
• With protective plate, preventing both
access to the fixing screws or adjustment
of the head by unauthorized personnel
• Torx fixing screws
PL = b (category 1) / SIL 1

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Sliding guard on machines
without or with low inertia
Application
example
• Key operated switch
• With protective plate, preventing both
access to the fixing screws or adjustment
of the head by unauthorized personnel
• Torx fixing screws
PL = d (category 3) / SIL 2

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Sliding guard on machines
without or with low inertia
Application
example
PL = e (category 4) / SIL 3
• Safety limit switches with head for linear
movement (plunger) or rotary movement (lever)
• Safety module
• With protective plate, preventing both access
to the fixing screws or adjustment of the head
by unauthorized personnel
• Torx fixing screws
• Proposed solution:
• Used in pairs, with one switch in positive mode
and the other in negative mode

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Sliding guard on machines
without or with low inertia
Application
example
PL = e (category 4) / SIL 3
• Safety limit switch with head for
linear movement (plunger) or rotary
movement (lever)
• Key operated switch
• Safety module
• With protective plate, preventing both
access to the fixing screws or adjustment
of the head by unauthorized personnel
• Torx fixing screws

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Sliding guard on machines
with inertia
Application
example
PL = d (category 3) / SIL 2
• Safety interlock switch with solenoid
• Safety module for zero speed detection
• With protective plate, preventing both access
to the fixing screws or adjustment of the head
by unauthorized personnel
• Torx fixing screws

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Sliding guard on machines
with inertia
Application
example
PL = e (category 4) / SIL 3
• Safety interlock switch with solenoid
• Safety module for zero speed detection
• Safety limit switch
• Safety module
• With protective plate, preventing both access
to the fixing screws or adjustment of the head
by unauthorized personnel
• Torx fixing screws

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Sliding guard on machines
with inertia
Application
example
PL = e (category 4) / SIL 3
• Safety interlock switch with solenoid
• Safety limit switch
• Safety controller
• With protective plate, preventing both access
to the fixing screws or adjustment of the head
by unauthorized personnel
• Torx fixing screws

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How to select the right safety switch?
1. Choose a body according to environment
• Place to install and duty requested
̶ Size product and material
2. Choose the function according to the type of machine to protect
• The detection movement type linear, rotary, with interlock
̶ After the adapted plunger, lever, or key
3. Choose the contact according to the automatism function to achieve
• Snap or slow; 2 or 3 safety contacts; auxiliaries additional contacts, etc.
4. Choose the electrical connection according habits (geographical use)

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Your safety sensing guide :
Reference document : DIA4ED1121001EN

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Where to find details
• Click here to find info on SE.com
• Click here to find safety sensors on SE.com
• Click here to access our Digicat
• Click here to access to CAD files
• Click on the link below for FAQs (frequently asked
question)