Safety Technology — Available Products
Siemens 3SB3400-0A
$64.00
Siemens 3SB3400-0B
$25.00
Siemens 3SB3400-0C
$40.00
SIEMENS 3SK1111-1AB30
$332.00
Siemens 3SK1111-1AW20
$216.00
Siemens 3SK1111-2AB30
$250.00
Siemens 3SK1112-1BB40
$403.00
Siemens 3SK1121-1CB41
$490.00
SIEMENS 3SK1121-1CB42
$539.00
Siemens 3SK1121-2AB40
$750.00
Siemens 3SK1121-2CB41
$2,098.00
Siemens 3SK1211-1BB40
$232.00
Siemens 3SK1211-2BB40
$586.00
Overview
Siemens safety devices in this family cover the 3SK safety relay range together with the 3SB command and signaling devices catalogued alongside it. The family holds 13 catalogued part numbers.
Series in this family
- 3SK Safety Relays — 10 catalogued parts across the 3SK1 and 3SK2 generations.
- 3SB Command & Signaling — 3 catalogued parts across 3SB1, 3SB2 and 3SB3, the earlier command-device range.
By classification the catalogued parts fall into Safety Relays (10) and Push Buttons & Pilot Devices (3). The 3SK generations differ in wiring and expansion behaviour, so read the complete order number from the installed relay before selecting a replacement. Open the series above for the catalogued list, or send the 3SK or 3SB order number with a quote request.
Machine down? Get a fast quote on Safety Technology parts.
New, surplus, and refurbished Siemens options. Request a quote or speak directly with an automation specialist for emergency sourcing.
Common Faults
Common Faults
- Capacitor degradation after 7–10 years of service
- Communication errors after firmware drift
- Input/output channel failure from over-voltage events
- Cooling fan failure causing thermal shutdown
- Connector wear in high-vibration installations
Troubleshooting Basics
Troubleshooting
- Confirm supply voltage and grounding
- Inspect diagnostic LEDs and fault codes
- Verify firmware/configuration matches the application
- Swap with a known-good unit to isolate the fault
- Check field wiring and termination
Replacement Options
Replacement Options
- Direct OEM replacement (preferred)
- Refurbished OEM unit (cost-effective)
- Compatible cross from the same manufacturer's current catalog
- Equivalent from an alternative manufacturer (engineering review required)
Migration Recommendations
Migration Path
When migrating away from discontinued units, plan for: firmware compatibility, wiring changes, software/configuration migration, spare-parts stock, and field commissioning. Palm Parts Solution can supply both the current generation and stock of the legacy unit while you plan the migration.
Compatibility
Compatibility
Units in this family are compatible with the manufacturer's standard control architecture, communication protocols (where applicable), and accessory ecosystem. Always cross-reference the exact catalog number, firmware revision, and hardware series before installation.
Browse by Series
3SB Command & Signaling series — specifications, replacements, and availability. New, surplus, and refurbished stock with warranty.
3SK Safety Relays series — specifications, replacements, and availability. New, surplus, and refurbished stock with warranty.
Product Types in this Family
Frequently Ordered Together
Frequently Ordered
Customers ordering from this family frequently pair the unit with matching cables, terminal blocks, mounting kits, and surge protection. Contact our team for a complete BOM review.
Compatible & related families
Why Buy From Palm Parts Solution
DHL, FedEx, UPS — door-to-door in 1-4 business days.
RFQs sent during business hours are answered the same business day.
New, surplus and refurbished Siemens options — request current availability.
24/7 emergency sourcing for production-critical failures.
Custom pricing on volume, repair, and hard-to-find SKUs.
Talk to engineers, not call-center agents.
We hunt down discontinued and obsolete parts globally.
Lifecycle-end Siemens parts — sourced, tested, warrantied.
Frequently asked questions
What is the Safety Technology family used for?
The Safety Technology family from Siemens covers industrial automation applications such as machine control, process control, motor control and discrete I/O. Browse the series below to find the exact part number for your installation.
Are obsolete Safety Technology parts still available?
Yes. We stock new surplus, refurbished and end-of-life Safety Technology units from Siemens. If a part number is no longer in production we will identify a compatible replacement or repair your existing module.
How do I identify the correct Safety Technology replacement?
Match the catalog number printed on the Safety Technology label, then confirm voltage, I/O count, communication protocol and firmware revision. Our team can validate compatibility against your original Siemens configuration before shipment.
Do Safety Technology parts come tested?
Every Safety Technology unit we ship is functionally tested against Siemens OEM specifications. Refurbished items include a 1-year warranty and a full inspection report on request.