Siemens 3su1000-1hb20-0aa0

By Abdullah Zahid
14 min read
Siemens 3SU1000-1HB20-0AA0 red 22mm mushroom emergency stop pushbutton for industrial control panel safety circuits

Siemens 3SU1000-1HB20-0AA0 Emergency Stop Mushroom Pushbutton, 22 mm, Round, Plastic, Red, Positive Latching — Specifications, Wiring, and Selection Guide

Controls engineers and panel designers searching for the Siemens 3SU1000-1HB20-0AA0 are typically at the final stage of component selection — confirming that this specific 22 mm round emergency stop pushbutton meets EN ISO 13850 requirements, fits their panel cutout, and integrates cleanly with their existing SIRIUS ACT ecosystem before raising a purchase order. This is a positive latching mushroom-head operator with a red plastic housing, part of the SIRIUS ACT actuators and indicators family, and it ships as a base unit only — contact blocks from the 3SU10-00 series must be ordered separately.

If you have already confirmed this is the right part, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the 3SU1000-1HB20-0AA0 — and Who Shouldn't

This pushbutton is the right choice for engineers and buyers who meet all of the following criteria:

  • Your panel cutout is exactly 22 mm round — this is a hard mechanical constraint with no adjustment
  • EN ISO 13850 compliance is explicitly required by your machinery directive or safety standard
  • Your application demands positive latching (rotate-to-unlatch reset), not a spring-return push-reset mechanism
  • You are specifying or sourcing within an existing SIRIUS ACT panel ecosystem and require native compatibility
  • You are prepared to order contact blocks from the 3SU10-00 series as separate line items — the base unit provides no integrated switching
  • Your installation environment falls within the -25 to +70°C operating temperature range

If your panel requires a 40 mm mushroom head for greater visibility, look at the ZY10 or ZY15 suffix SIRIUS variants. If you need a metal housing for high-impact or unprotected outdoor environments, or if your application demands pre-integrated contact blocks, a different variant or family is the correct choice.

On this page:

What the 3SU1000-1HB20-0AA0 Actually Does in a Safety Circuit

The Siemens 3SU1000-1HB20-0AA0 is a panel-mount operator interface — not a complete switching device. When the red mushroom head is pressed, the positive latching mechanism locks the button in the actuated position. It remains there until an operator physically rotates the head to unlatch it, per the EN ISO 13850 reset requirement. That physical action is the only way to return the device to its rest state, which prevents accidental or unintended machine restart — a core regulatory intent of the standard.

The base unit itself carries no electrical contacts. All switching function is delivered through modular contact blocks from the 3SU10-00 series, which mount to the rear of the housing. This separation is deliberate: it allows the same 22 mm operator housing to serve NO, NC, or changeover circuit requirements depending on which contact block is installed. The device sits at the operator interface layer of the safety architecture, between the panel surface and the safety control logic — whether that logic is a Siemens F-series safety PLC, a SIRIUS safety relay, or a hardwired relay circuit.

The housing material is plastic, colored red per EN ISO 13850 requirements. The operating temperature range is -25 to +70°C, covering the majority of standard industrial indoor environments. The 22 mm round panel cutout is a fixed mechanical dimension — there is no adapter or bushing that adjusts this to a different hole size.

Typical System Architecture: Where This Part Sits in the Signal Chain

The 3SU1000-1HB20-0AA0 occupies the operator interface position in a hardwired safety chain, bridging the physical panel surface and the downstream safety logic that acts on the emergency stop signal.

  • Safety controller or PLC (Siemens S7 F-series, SIRIUS safety relay, or hardwired relay logic) monitors the emergency stop input channel
  • 24 V DC or AC safety circuit runs from the controller input to the contact block terminals on the rear of the 3SU1000-1HB20-0AA0
  • The 3SU1000-1HB20-0AA0 base unit with installed 3SU10-00 contact block sits at the panel surface, actuated by the operator
  • On button press, the NC contact opens (or NO contact closes), changing the circuit state and triggering the downstream safety response
  • The safety controller detects the input change and initiates the configured stop function — halting hazardous motion, de-energizing outputs, or triggering a controlled shutdown sequence

Industries and Applications That Specify This Emergency Stop

Heavy manufacturing and automotive assembly lines are the most common deployment environments for the 3SU1000-1HB20-0AA0. Production line emergency shutdown buttons integrated into main control panels represent the highest-volume use case — the 22 mm form factor fits standard panel layouts, and the positive latching mechanism satisfies the EN ISO 13850 requirement for machinery on the EU market.

Food and beverage processing and pharmaceutical manufacturing specify this device where hygiene and auditability matter — the documented EN ISO 13850 compliance simplifies safety validation documentation, and the modular contact block design allows the same base unit to serve different circuit configurations across a facility without maintaining multiple housing types in inventory.

Machine builders retrofitting aging equipment to meet current safety standards frequently specify the 3SU1000-1HB20-0AA0 because the 22 mm cutout is the most common existing panel hole size in older control cabinets, making it a direct mechanical replacement. Packaging machinery, mining equipment, and mobile equipment such as cranes and gantries — where hardwired emergency stop stations are required at multiple operator positions — also represent strong application fits.

Application Typical Deployment
Production line emergency shutdown Integrated into main control panel; NC contact wired to safety relay or F-PLC input
Machinery guard access point Mounted at guard door or access gate; triggers safeguard shutdown on actuation
Mobile equipment (cranes, gantries) Multiple hardwired emergency stop stations; positive latching prevents unintended restart
Retrofit of aging machinery Direct 22 mm replacement of non-compliant legacy buttons; brings equipment to EN ISO 13850
Pharmaceutical / food processing panels Modular contact blocks allow circuit customization without changing operator housing
Hazardous area equipment Mounted in sealed enclosure; enclosure design provides area classification compliance

Purchase-Decision Specifications and Variant Comparison

Parameter Value
Panel Cutout Diameter 22 mm round (fixed — no adapter available)
Operating Temperature Range -25°C to +70°C
Mushroom Head Color Red (EN ISO 13850 requirement)
Housing Material Plastic
Latching Mechanism Positive latching — rotate-to-unlatch reset
Contact Integration None — contact blocks ordered separately (3SU10-00 series)
Standard Contact Rating 10 A @ 230 V AC (with standard contact block)
Protection Rating IP65 or better (dependent on contact block selection)
Regulatory Compliance EN ISO 13850, Machinery Directive 2006/42/EC
Product Family SIRIUS ACT (Actuators and Indicators)

Full technical specifications are available on the product page at LeadTime.ca.

Feature Siemens 3SU1000-1HB20-0AA0 SIRIUS ACT 40 mm Variants (ZY10/ZY15) Schneider Electric XAC-A22 Eaton M22-PVT
Panel Cutout 22 mm round 40 mm round 22 mm round 30 mm round
Positive Latching Yes Yes Yes Optional
EN ISO 13850 Certified Yes Yes Yes Yes
Contact Blocks Integrated No — separate purchase No — separate purchase Integrated options available Integrated options available
Operating Temperature -25 to +70°C -25 to +70°C -25 to +70°C -20 to +60°C
Base Unit Cost (USD) 45–75 Moderate 55–85 35–65
North American Availability High High High High
Typical Lead Time 2–4 weeks 2–4 weeks 2–4 weeks 1–3 weeks

If your panel layout uses a 22 mm round cutout and your safety circuit requires EN ISO 13850 positive latching compliance within a SIRIUS ACT ecosystem, the 3SU1000-1HB20-0AA0 is the direct choice — check current availability at LeadTime.ca.

Contact Block Selection: The Separate Purchase You Cannot Forget

The single most common procurement error with the 3SU1000-1HB20-0AA0 is placing an order for the base unit alone and discovering on installation day that no contact blocks were sourced. The operator housing provides zero switching function without a 3SU10-00 series contact block installed on the rear terminals. This is not a fault — it is an intentional modular design that allows a single housing to serve multiple circuit configurations — but it must be planned at the point of order.

Contact block selection depends entirely on your safety circuit architecture. A normally closed (NC) contact block is the standard choice for direct emergency stop circuit interruption — the NC contact opens when the button is pressed, breaking the safety circuit and triggering shutdown. A normally open (NO) contact is used where the button press generates a positive trigger signal rather than a circuit break. A changeover block provides both simultaneously, which is required for dual-channel safety monitoring configurations.

Contact Type Model Example Typical Application Typical Cost (USD)
Single NO (normally open) 3SU10-00-1KA30 Signal or indicator circuit, non-critical trigger 18–25
Single NC (normally closed) 3SU10-00-1KA20 Direct emergency stop circuit break, safety relay trip 18–25
Changeover (NO+NC) 3SU10-00-1KA50 Dual-channel safety monitoring, complex logic circuits 30–40
High-current NO 3SU10-00-2KA30 High-power motor circuits 35–50
High-current NC 3SU10-00-2KA20 High-power emergency shutdown 35–50

The standard contact rating for the 3SU10-00 series is 10 A at 230 V AC. High-current variants are available for circuits exceeding this rating. Confirm your circuit voltage and current requirements before selecting a contact block, and verify that the specific contact block part number is in stock at the same time you confirm availability of the base unit — they are separate catalog items with independent stock status.

Expert Verdict: When This Part Is Right and When It Isn't

The 3SU1000-1HB20-0AA0 is a well-proven, compliant emergency stop operator for controls engineers working within EN ISO 13850-governed machinery, particularly in facilities already standardized on the SIRIUS ACT product family. The positive latching mechanism is a regulatory strength — it satisfies the non-accidental-restart requirement across EU-market machinery, and the modular contact block approach gives panel designers the flexibility to configure the same housing for NC-only, NO-only, or changeover circuits without stocking multiple complete assemblies. The 22 mm cutout aligns with the most common standard panel opening in industrial cabinets, and the -25 to +70°C operating temperature covers the overwhelming majority of indoor manufacturing environments.

Where this device has genuine limits: the plastic housing is not appropriate for unprotected outdoor installation, high-impact environments, or applications where the panel surface faces regular physical abuse. Engineers requiring a 40 mm mushroom head for higher visibility or gloved-hand operation at distance should look at the ZY10 or ZY15 suffix SIRIUS variants. If your project requires pre-integrated contact blocks to simplify procurement and reduce the risk of missing items on delivery — variants with -ZY19 or -ZY11 suffixes include integrated contact options at a higher unit cost. The device also carries no ATEX rating on its own; hazardous area compliance must be achieved through the enclosure design.

From a procurement standpoint, the 3SU1000-1HB20-0AA0 base unit sits in the USD 45–75 range, with contact blocks adding USD 15–50 depending on configuration — a total system cost of approximately USD 60–120 for a complete assembled emergency stop station. Typical lead time in North America is 2–4 weeks under normal conditions, though demand spikes or supply chain disruptions can extend this to 6–8 weeks. Ordering 10–15% spare units alongside the primary build quantity is a practical strategy for high-availability machinery where emergency stop components are critical replaceable items. If this matches your system requirements, view current stock and pricing at LeadTime.ca.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

  • Verify the panel cutout is exactly 22 mm round and free of burrs before inserting the mushroom head and collar assembly from the panel front; secure the threaded collar nut on the rear — hand-tight plus one quarter-turn is the standard torque
  • Mount the selected 3SU10-00 contact block on the rear terminals of the base unit before connecting any wiring — orientation matters; refer to the contact block datasheet for correct mounting direction
  • Connect the contact block terminals to your safety circuit using appropriate wire gauge and strain relief; NC contacts should be wired in series with the safety circuit to break the circuit on button press
  • Before energizing, verify continuity through the installed contact block with a multimeter — NC blocks should show continuity at rest, NO blocks should show open circuit at rest
  • After power-up, perform a functional test: press the mushroom head, confirm the downstream safety circuit responds correctly, then rotate the head to unlatch and verify the circuit resets — document the contact block model number and wiring configuration for maintenance records

EN ISO 13850, CE Marking, and ANSI/NFPA 79 Compliance

EN ISO 13850 specifies the functional and safety requirements for emergency stop devices — mushroom head shape, red color, positive latching mechanism, and rotate-to-unlatch reset method. The 3SU1000-1HB20-0AA0 meets all four of these requirements by design. Positive latching ensures the device remains in the actuated state until a deliberate manual reset action is taken, which is the core safety behavior the standard requires — preventing any unintended restart of hazardous machine motion.

The device carries CE marking as a declared component under Machinery Directive 2006/42/EC. This means the pushbutton itself is compliant at the component level, but the final machine integrating this device must still undergo a full Machinery Directive conformity assessment. The emergency stop function must be included in the overall machine risk analysis — the pushbutton alone does not confer CE marking on the finished machine.

In North American applications, ANSI/NFPA 79 — the electrical standard for industrial equipment — recognizes EN ISO 13850-compliant components. While not universally mandated in all U.S. jurisdictions, specifying EN ISO 13850-compliant emergency stop devices is considered best practice and is increasingly referenced in OSHA-aligned risk assessments. For IEC 61508 functional safety applications, the 3SU1000-1HB20-0AA0 can support the required safety integrity level when paired with appropriately SIL-rated contact blocks and a correctly designed safety circuit.

Wrong-Part Prevention: What Engineers Get Wrong When Ordering This Part

Before finalizing your purchase order, run through this checklist verbatim — each item represents a confirmed source of ordering errors or installation failures with this specific model:

  1. Verify panel cutout size is exactly 22 mm round (not 30 mm, 40 mm, or square)
  2. Confirm contact sets are ordered as separate line items (model numbers starting with 3SU10-00 contact block range)
  3. Check that EN ISO 13850 compliance is explicitly required by your machinery directive or safety standard
  4. Ensure positive latching (rotate-to-unlatch) is the required reset type, not spring-return push-reset
  5. Verify operating temperature range (-25 to +70°C) matches your installation environment
  6. Confirm availability of matching contact blocks; do not substitute with non-SIRIUS contact sets
  7. Check that your PLC or safety module can interface with basic NO/NC contacts (this device provides only electrical contacts, no integrated logic)

If any item on this checklist reveals a mismatch, contact the LeadTime.ca team before ordering — we can confirm the correct variant or contact block configuration for your application.

Frequently Asked Questions

Do I need to order contact blocks separately, or are they included with the 3SU1000-1HB20-0AA0?

Contact blocks are not included with the base unit and must be ordered separately from the 3SU10-00 series. The 3SU1000-1HB20-0AA0 is an operator housing only — it provides no electrical switching without a contact block installed. Confirm your required contact type (NO, NC, or changeover) and order the corresponding contact block as a separate line item at the same time as the base unit to avoid project delays.

What happens if my panel cutout is 30 mm instead of 22 mm?

The 3SU1000-1HB20-0AA0 will not fit a 30 mm cutout — the threaded collar will not engage the panel, and the mushroom head will not seat correctly. The 30 mm cutout corresponds to a different product series. You will need to either modify the panel opening to 22 mm round or specify an emergency stop model designed for a 30 mm cutout. Do not use adapter bushings as a workaround for safety-critical components.

Is the positive latching mechanism compliant in North American jurisdictions, or is it only an EU requirement?

Positive latching per EN ISO 13850 is a mandatory requirement for EU-market machinery under the Machinery Directive 2006/42/EC, and the same functional requirement is recognized in ANSI/NFPA 79 for North American industrial equipment. While specific local mandates vary by jurisdiction, positive latching is considered best practice across virtually all industrial safety frameworks and is increasingly referenced in OSHA-aligned risk assessments. Specifying a positive latching device for any new machinery installation is the technically defensible choice regardless of geography.

Can I install the 3SU1000-1HB20-0AA0 outdoors or in a washdown environment?

The plastic housing is not rated for unprotected outdoor exposure or high-impact environments. With an appropriate contact block from the 3SU10-00 series, the assembled unit can achieve IP65 or IP67 protection — but this applies to the enclosure sealing, not to direct exposure to submersion or aggressive chemical washdown. For outdoor or washdown applications, verify that the specific contact block chosen provides the required IP rating and that the panel enclosure provides additional environmental protection.

What is the realistic lead time if I order today, and how do I protect my project timeline?

Under normal supply conditions, the 3SU1000-1HB20-0AA0 and 3SU10-00 contact blocks are available from major industrial distributors with typical lead times of 2–4 weeks in North America. During industry demand peaks or supply chain disruptions, this can extend to 6–8 weeks. The safest approach is to order both the base unit and the required contact blocks simultaneously, confirm stock status at the point of order, and factor in a 10–15% spare quantity for critical machinery to avoid extended downtime if a replacement is needed urgently.

Can I use non-SIRIUS contact blocks with this operator housing?

Non-SIRIUS contact blocks should not be substituted. The 3SU1000-1HB20-0AA0 is mechanically and electrically designed for the 3SU10-00 series contact blocks. Substituting a non-SIRIUS contact block risks mechanical incompatibility, loss of IP rating, and — critically — loss of the EN ISO 13850 compliance documentation chain for your safety assessment. Always use matched 3SU10-00 series contact blocks.

Why Order From LeadTime.ca

  • LeadTime.ca ships the Siemens 3SU1000-1HB20-0AA0 and 3SU10-00 series contact blocks worldwide — no geographic restriction on sourcing
  • Sourcing support for hard-to-locate contact block configurations and SIRIUS ACT variants that are out of stock at volume distributors
  • Volume pricing available for machine builders and facilities ordering multiple emergency stop stations — contact the team directly for project quotes
  • Fast response to lead time and stock inquiries before you commit to a build schedule

At-a-Glance Summary

  • Model: Siemens 3SU1000-1HB20-0AA0 — Emergency Stop Mushroom Pushbutton, 22 mm, Round, Plastic, Red, Positive Latching
  • Panel cutout: exactly 22 mm round — a fixed, non-adjustable mechanical constraint
  • Operating temperature: -25 to +70°C
  • Latching mechanism: positive latching, rotate-to-unlatch reset per EN ISO 13850
  • Contact blocks: not included — must be ordered separately from the 3SU10-00 series (NC for direct circuit break, NO for trigger signal, changeover for dual-channel monitoring)
  • Standard contact rating: 10 A @ 230 V AC with standard 3SU10-00 block
  • Protection rating: IP65 or better depending on contact block selection
  • Compliance: EN ISO 13850, Machinery Directive 2006/42/EC, recognized under ANSI/NFPA 79
  • Typical base unit cost: USD 45–75; contact blocks add USD 15–50; total system USD 60–120
  • Typical lead time: 2–4 weeks under normal conditions; 6–8 weeks during demand peaks
  • Product family: SIRIUS ACT (Actuators and Indicators) — natively compatible with Siemens PLC and safety relay ecosystems