Pilz 750107 4 N/O + 1 N/C Contact Expansion

Description

Product Introduction & Engineering Value

The Pilz 750107 solves a very specific panel-design problem: adding additional instantaneous safety contacts to an existing compatible safety-control circuit without replacing the base safety device. Its compact 17.5 mm housing allows the expansion function to fit into tightly packed DIN-rail control cabinets.

The module operates from 24 V DC and provides four normally open and one normally closed contact. Pilz specifies it for instantaneous contact expansion in conjunction with safety-related control components.

Technical Specifications

Pilz’s current product page lists 24 V DC supply, 2 W DC consumption, 4 N/O and 1 N/C relay contacts, and 6 A maximum ratings for the specified AC1/DC1 categories.

The published operating manual additionally specifies a 70 mA input-circuit current, 2.7 A maximum inrush pulse, 100% duty cycle, and -20%/+20% supply-voltage tolerance.

750107

750107

Field Application & the “Trench” Experience

A common cabinet modification involves an existing machine that already has a validated safety relay circuit, but the machine builder later needs additional safety contacts—for example, to provide separate safety feedback to a contactor circuit, control system, or another compatible safety-related function.

Suppose a machine has a Pilz safety-control base unit already installed and the retrofit requires several additional contacts. Replacing the entire safety controller would create unnecessary wiring and validation work. The 750107 can provide the required contact expansion when the base device and circuit architecture support the PNOZ s7.

Practical applications include:

1. Emergency-stop circuit expansion — distributing safety relay contacts to multiple machine shutdown circuits.
2. Guard-door safety systems — providing additional contacts for compatible safety-related switching functions.
3. Motor contactor control — expanding available safety contacts for machine power-removal circuits.
4. Press and machine-tool safety circuits — adding contact capacity around an existing validated safety-control architecture.

Pilz describes the 750107 specifically as a contact block for expansion in connection with safety-related control components.

Transparency SOP: QA & Testing

For a New Surplus or refurbished 750107, testing should establish both the electrical condition and the correct product variant.

Recommended inspection procedure:

1 — Identity check: Verify 750107, PNOZ s7 labeling, 24 V DC version, and screw-terminal configuration.

2 — Mechanical inspection: Check the DIN-rail housing, plug-in terminal blocks, terminal retention, enclosure, and locking mechanism for damage.

3 — Coil/input test: Apply the specified 24 V DC supply under controlled conditions and verify the module’s input behavior.

4 — Contact test: Check each N/O and N/C contact for correct state transition and electrical continuity.

5 — Load simulation: Where appropriate, test contacts under a controlled representative load rather than relying only on a continuity meter.

6 — Documentation: Record the test result, product condition, date/lot information where available, and the seller’s warranty.

Pilz currently provides an operating manual and product documentation for the 750107, while the manufacturer’s product page lists the module’s certifications and technical data.

The Veteran’s Tech Trap Guide

⚠️ Trap #1 — Treating the 750107 as a standalone safety relay

It isn’t. The PNOZ s7 is a contact-expansion module. It is intended to operate in conjunction with compatible safety-related control components. Replacing a failed base safety controller with a 750107 would not be an equivalent substitution.

⚠️ Trap #2 — Confusing 750107 with 751107

The two numbers look almost identical, but they use different terminal arrangements. 750107 uses plug-in screw terminals, while 751107 uses spring-loaded terminals. Pilz lists them as separate product variants.

PRO TIP: Before ordering, photograph the terminal side of the existing module. For PNOZsigma replacements, the terminal style is a quick way to catch a wrong-part shipment before installation.

⚠️ Trap #3 — Assuming every contact can carry the same safety load

The published 6 A figure is tied to specific utilization categories and voltage conditions. It should not be interpreted as a universal 6 A rating for every possible safety application. Check the applicable AC1, DC1, AC15/DC13, and system-specific requirements before sizing the connected load.

Dynamic FAQ

What is Pilz 750107?

750107 is the Pilz PNOZ s7, a 24 V DC PNOZsigma contact-expansion module providing four normally open and one normally closed contact.

Is 750107 a complete safety controller?

No. It is a contact expansion module intended for use with compatible safety-related control components.

What is the difference between Pilz 750107 and 751107?

Both are PNOZ s7 variants with 24 V DC operation and 4 N/O + 1 N/C contacts. 750107 has plug-in screw terminals, while 751107 has spring-loaded terminals.

What is the contact rating?

Pilz specifies up to 6 A at 240 V AC under AC1 and 6 A at 24 V DC under DC1. Actual permissible current depends on the utilization category and application conditions.

Is Pilz 750107 still available?

Pilz’s current product page continues to identify 750107 as the PNOZ s7 24 V DC contact-expansion module, and current distributor listings also show the part. Availability should nevertheless be confirmed against the supplier’s current inventory.

Does New Surplus 750107 include an OEM warranty?

Not automatically. New Surplus normally describes the inventory condition rather than guaranteeing an active Pilz factory warranty. Confirm the seller’s warranty period, test procedure, packaging condition, and return terms before issuing a purchase order.