Distributors quoting access control jobs run into the same request more often than most people realize. “These two doors need to work together.” Maybe it’s a shared bathroom between two hospital rooms. Perhaps it’s a mantrap protecting a server room. Maybe it’s a full vestibule interlock at a building’s main entrance. Sometimes it’s an adjustable timer application layered onto both doors.
Each of these applications sounds like a different job requiring a different product. In reality, they’re all variations on the same underlying need. DeltrexUSA built one platform — the 902 Series — to answer all of them. It’s worth understanding the full family if you’re not already quoting it that way. Every configuration ships USA-made, code-conforming, and ADA compliant. That means one manufacturer relationship can cover a surprising range of two-door jobs. These are the ideal solutions for two door interlock systems, whether the priority is privacy, security, or controlled entry. Once you see the pattern, you’ll start spotting a two door interlock system opportunity in almost every quote.
902A: Shared bathroom privacy
The 902A system is built for a shared bathroom between two rooms. This setup is common in dormitories, hospitals, nursing homes, and convalescent facilities. Neither door can be locked or unlocked without the other. Deltrex USA’s lock-out protection circuitry prevents doors from being locked from outside. It also prevents accidental lockouts from closing both doors after someone exits. It’s available as 902A (two manual doors), 902AA (two auto-operated doors), or 902AC (one manual, one auto-operated). That fits both new construction and a retrofit where only one side needs automation.
902B: Mantrap without authentication
Sometimes the goal is simple: only one door open at a time. The 902B mantrap configuration is a two door interlock system built for that. It locks the second door until the first is confirmed secure. No card reader or credential check is required. It’s a straightforward physical-security layer for storage rooms and back-of-house areas. It also suits any two-door vestibule needing controlled sequencing. Here, sequencing matters more than identity verification.
902C: Mantrap with authentication (interlock)
Add a credential check to the same physical logic, and you get the 902C interlock — the configuration most distributors mean when they say “two-door interlock” for a secure area like a server room, evidence room, cash-handling area, or lab. Both doors are power-supplied and interlocked so a second door won’t release until the first securely closes, and it’s available for two manual doors, two auto-operated doors, or a mixed configuration.
902D: Building-entry vestibule interlock
For a main building entrance where the goal is a controlled vestibule rather than a small interior mantrap, the 902D configuration is built specifically for that “two doors, unlocked” entry-interlock application — available for two auto-operated doors or a mixed manual/auto pair.
902E: 2-door adjustable timer
Rounding out the family, the 902E adds a 365-day adjustable timer with power supply and door control — useful for facilities that need the doors to behave differently by day or time (business hours vs. after-hours, for example) without a full access control system layered on top.
Why this matters for your line card
A lot of distributors quote a mantrap, an interlock, and a shared-bathroom job as if they’re three unrelated products from three different catalogs. They’re not — with the 902 Series, it’s one platform with five configurations, all USA-made, code-conforming, and ADA compliant. That means less time relearning a new system for each job type, and one manufacturer relationship covering a wider range of two-door security jobs than most distributors realize.
Whether you’re quoting a dormitory renovation, a data center mantrap, or a lobby vestibule, it’s worth checking whether the job fits somewhere in the 902 Series before sourcing a separate product. Call 718-401-4006 or visit deltrexusa.com/interlock-system to see the full configuration options.