440G-S36001 — Trojan 5 Non-Contact Safety Interlock Switch

The 440G-S36001 is a non-contact safety interlock switch from the Trojan 5 series, designed for guarding moving parts and hazardous areas on industrial machinery. It monitors the position of a guard door, access gate, or hinged panel using a coded actuator — when the actuator and switch head are separated (guard open), the switch opens its safety outputs; when properly engaged (guard closed), both safety outputs close. No physical contact between actuator and switch is required, which eliminates the contact wear that limits traditional tongue-type safety interlock switches over millions of guard operations.

The non-contact, coded actuator design also provides resistance to defeat — a standard magnet cannot actuate the switch in place of the coded key, making it more tamper-resistant than simple magnetic proximity switches. This matters in risk assessments where the possibility of deliberate bypass needs to be addressed as part of the safety function design.

Specifications

Parameter	Value
Part Number	440G-S36001
Series	Trojan 5
Detection Method	Non-contact coded RFID actuator
Safety Outputs	2 × NC (normally closed) safety contacts
Auxiliary Output	1 × NO (normally open) auxiliary contact
Switching Voltage	24V DC / 240V AC
Switching Current (max)	3 A (DC / AC)
Operating Distance (ON)	0–10 mm (actuator to switch face)
Operating Distance (OFF)	> 15 mm
Safety Rating	SIL 2 (IEC 62061), PLe Category 4 (ISO 13849-1)
Actuator Type	Coded RFID key (440G-A27001 or equivalent)
Housing Material	Glass-fiber reinforced thermoplastic
Enclosure	IP67
Operating Temperature	−25°C to 70°C
Standards	IEC 60947-5-3, EN ISO 14119, UL 508, CE

PLe Category 4 — What the Rating Requires in Wiring

The safety contact outputs on the 440G-S36001 are two independent NC contacts. For PLe Category 4, both contacts must be monitored — the safety controller (or safety relay) must check that both contacts open when the guard opens and both close when the guard closes, and must detect if one contact fails to operate (a "stuck" contact).

This requires wiring both NC contacts to the monitoring inputs of a safety relay or safety PLC with dual-channel input capability. Connecting only one contact, or wiring both contacts in parallel to a single input, reduces the achievable performance level to PLd or lower regardless of the switch's own certification. The PLe/Category 4 rating belongs to the complete safety function, not to the switch alone.

The auxiliary NO contact provides a status output for the standard control circuit — confirming guard state to the machine controller without using the safety circuit contacts for non-safety purposes. Safety contacts should only switch safety-rated inputs; using them for standard PLC I/O or indicators depletes their contact life and can introduce interference into the safety circuit.

FAQ

Q: Can the switch be defeated by a strong magnet?

The coded RFID actuator is significantly more tamper-resistant than a simple magnetic proximity switch — a standard magnet will not actuate the safety outputs. Defeating the switch requires either the correct coded actuator or deliberate physical interference with the switch housing, both of which require sustained effort and would be apparent on inspection.

Q: What actuator is compatible with the 440G-S36001?

The switch uses a matched coded RFID actuator. The standard actuator for this switch is the 440G-A27001. Using a different actuator model, even from the same series, may not produce reliable actuation — verify actuator compatibility against the switch's documentation before specifying.

Q: Does the IP67 rating mean it can be used in wash-down environments?

IP67 covers temporary immersion to 1 m depth — it handles wash-down and spray cleaning. For continuous immersion or high-pressure steam cleaning, a higher IP or specific wash-down rating would be required. Verify cleaning process parameters against the switch's environmental specification.

Q: Can multiple Trojan 5 switches be wired in series on one safety input?

Multiple switches can be wired in series on a zone guard circuit, but this reduces the achievable performance level because a single contact failure in the chain may not be individually detectable. For PLe Category 4, each switch should either be individually monitored or the series chain evaluated against the PFH (probability of failure on demand) limits for the required performance level. A qualified safety engineer should assess the series wiring architecture.

Q: Does the switch include a locking mechanism to prevent guard opening while the machine is running?

No. The 440G-S36001 is an interlock switch — it detects guard position but does not physically hold the guard closed (guard locking). For applications where the guard must be held closed until a safe condition is reached (e.g., a hazardous area with a run-down time), a guard locking device from the 440G-L or equivalent series is required alongside or instead of this switch.

440G-S36001 New Sealed 440GS36001 Guardmaster Safety Switch