KBN3L21 – “””STRAIGHT “”””T”””” KEY PLASTIC SAFETY SWITC”

Q: What is the Lovato KBN3L21 used for?

The Lovato KBN3L21 is used as a key-operated safety limit switch for machine guards, access doors and industrial safety interlock applications.

Q: What contact arrangement does the KBN3L21 have?

The KBN3L21 features two normally open and one normally closed slow-action contacts.

Q: What type of actuator does the KBN3L21 use?

The KBN3L21 uses a straight "T" key actuator designed for key-operated safety switching.

Q: What protection rating does the KBN3L21 have?

The Lovato KBN3L21 has an IP65 protection rating suitable for industrial environments.

Lovato Electric KBN3L21 electrical installation component for professional commercial and industrial assemblies, suitable for maintenance, replacement and panel building applications.

SKU: KBN3L21MPN: KBN3L21

List Price £86.11 ex VAT

Your Price (ex VAT) Save 40%

£51.67 40% OFF

You save £34.44 per unit

Manufacturer Lead Time Please contact us for a delivery time before you order

Get the best trade prices Trade exclusive

Create an online account to unlock exclusive pricing, special offers and more.

Create an online account Quick & easy setup

Quantity:

SUBTOTAL (EX VAT) £51.67

Trade pricing is personalised to your account

Manufacturer Lead Time

£51.67

Lovato KBN3L21 Straight T Key Plastic Safety Switch 2NO+1NC

The Lovato Electric KBN3L21 is a professional key-operated safety limit switch from the K series, designed for dependable machine safety, industrial automation and protective guarding applications. Featuring a straight "T" key actuator, polymer thermoplastic housing and 2NO+1NC slow-action contacts, the KBN3L21 provides reliable switching performance for safety interlock circuits, machine guards and industrial control systems.

Manufactured to EN 50047 dimensional standards, the KBN3L21 features a bottom M20 cable entry, forced opening capability and a durable plastic body construction. This compact safety switch is suitable for monitoring machine doors, access points and protective guards where reliable safety switching is required.

Why Choose the Lovato Electric KBN3L21?

Genuine Lovato Electric component: Designed for reliable industrial safety and automation applications.
Key-operated safety design: Suitable for machine guards, doors and access point monitoring.
2NO+1NC slow-action contacts: Provides flexible switching for safety and control circuits.
Durable thermoplastic housing: Provides reliable operation in industrial environments.
Easy installation: EN 50047 compliant dimensions with M20 bottom cable entry.

Product Specifications

Manufacturer	Lovato Electric
Product Code	KBN3L21
Product Type	Safety Limit Switch
Series	KBN
Actuator Type	Straight "T" Key
Contact Configuration	2NO + 1NC Slow Action
Housing Material	Polymer Thermoplastic
Cable Entry	M20 Bottom Entry
Thermal Current Ith	10A
Rated Insulation Voltage Ui	690V
Rated Impulse Withstand Voltage Uimp	6kV
IEC/EN 60947-5-1 Designation	A600 Q600
Mechanical Life	100,000 cycles
Forced Opening	Yes
Operating Temperature	-25°C to +70°C
Protection Rating	IP65
Dimensions	30 x 30 x 93mm
Weight	94g
EAN	8013975115343

Applications

Machine guard safety monitoring
Industrial automation equipment
Safety interlock circuits
Manufacturing machinery protection
Control panels and electrical assemblies

Technical Specifications

Tick the specs you need, then view products that match.

Device Type	Limit switch accessory
Switching Action	Slow action
Housing Material	Plastic
Connection	M20 cable entry
Weight [g]	96
Qty. per package	1
Multiple qty. of packs per order	1
Package dimensions [mm]	100X044X032
Volume [cm³]	140.8
Bar code [EAN13]	8013975115343
Product designation	Key operated
Product type designation	KBN
Housing Material	Polymer thermoplastic
Key shape	Straight "T"
Type of contact	2NO+1NC Slow action
Thermal current Ith	10
IEC/EN 60947-5-1 designation	A600 Q600
Rated insulation voltage Ui [V]	690
Rated impulse withstand voltage Uimp	6
Insulation class	II
Short-circuit protection with fuse	10 gG/SC QUICK FUSE
min	16
max	14
IEC Conventional free air thermal current Ith	10
Resistance per pole (average value)	<10
Mechanical life	100000
B10d	100000
Mechanical operation	3600
Operating head fixing	Locking bayonet insert
min [mm²]	1.5
max [mm²]	2.5
Cable connection	Self-releasing screw terminal
Cable entry	M20 on the bottom
Pollution degree	3
min [°C]	-40
max [°C]	+70
ETIM 8.0	EC000030 - End switch
HS Code	85365080

Frequently Asked Questions

What is the Lovato KBN3L21 used for?

The Lovato KBN3L21 is used as a key-operated safety limit switch for machine guards, access doors and industrial safety interlock applications.

What contact arrangement does the KBN3L21 have?

The KBN3L21 features two normally open and one normally closed slow-action contacts.

What type of actuator does the KBN3L21 use?

The KBN3L21 uses a straight "T" key actuator designed for key-operated safety switching.

What protection rating does the KBN3L21 have?

The Lovato KBN3L21 has an IP65 protection rating suitable for industrial environments.

Device Type	Limit switch accessory
Switching Action	Slow action
Weight [g]	96
Qty. per package	1
Multiple qty. of packs per order	1
Package dimensions [mm]	100X044X032
Volume [cm³]	140.8
Bar code [EAN13]	8013975115343
Product designation	Key operated
Product type designation	KBN
Housing Material	Polymer thermoplastic
Key shape	Straight "T"
Type of contact	2NO+1NC Slow action
Thermal current Ith	10
IEC/EN 60947-5-1 designation	A600 Q600
Rated insulation voltage Ui [V]	690
Rated impulse withstand voltage Uimp	6
Insulation class	II
Short-circuit protection with fuse	10 gG/SC QUICK FUSE
min	16
max	14
IEC Conventional free air thermal current Ith	10
Resistance per pole (average value)	<10
Mechanical life	100000
B10d	100000
Mechanical operation	3600
Operating head fixing	Locking bayonet insert
min [mm²]	1.5
max [mm²]	2.5
Cable connection	Self-releasing screw terminal
Cable entry	M20 on the bottom
Pollution degree	3
min [°C]	-40
max [°C]	+70
ETIM 8.0	EC000030 - End switch
HS Code	85365080
Housing Material	Plastic
Connection	M20 cable entry

UK delivery

Delivery options

Free UK delivery on orders over £200 ex VAT. Order in-stock items before 2pm Monday to Friday for next-day delivery.

This product Lead time on request

Please contact us for a delivery time before you order

Standard delivery

£8 ex VAT · free over £200

UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.

Heavier items may be charged at a weight-based or pallet rate, shown at checkout.

Collect from our showroom

Mon–Fri, 8am–5pm

Order and pay online, then collect from our showroom.

Please allow 15–30 minutes after ordering for us to prepare your order.

Northern Ireland, ROI & export

Priced at checkout

We deliver to Northern Ireland, the Republic of Ireland and overseas.

Delivery is calculated at checkout based on your destination.

Orders with mixed availability

Shipped complete

If part of your order is on a lead time, we hold it and send everything together.

Need the in-stock items sooner? Ask us and we can split the delivery.

Business customer returns

Returns & order support

Need to return an item? Find the guidance for your order below, then contact our team before sending anything back.

Stocked items

Request within 30 days

Changed your mind or ordered the wrong item? Request a return within 30 days of receipt. There is no restocking charge.

Items must be unused, in resalable condition and in their original packaging, and returns need our approval first. Return carriage is at your cost, and the original delivery charge is not refunded.

Faulty or damaged items

Tell us as soon as possible

Faulty, damaged on delivery or the wrong product supplied? Contact our team as soon as possible with the details.

We will review the issue and arrange an appropriate resolution under our terms and conditions and your statutory rights.

Made-to-order items

Manufacturer approval needed

Manufactured, configured and special-order products can only be returned with the manufacturer’s approval. Any handling charge is agreed with you when you request the return.

This does not affect claims for faulty goods or items that do not meet the agreed specification.

LED Controls showroom with electrical products on display

Let’s get your return sorted.

Send your order number, product details and reason for return. For faults or delivery damage, include photographs if available. We will confirm the next steps.

Email returns team 01706 242050

The 30-day return request period applies to change-of-mind returns for stocked items. It does not limit your statutory rights for faulty or non-conforming goods.